Bono claims his voice improved after his father died.
The U2 frontman believes he was given a "gift" by his late dad Bob Hewson - who lost his battle with cancer in 2001 - after he passed away because his vocal range has improved in a way he always wanted.
He said: "You know, my father used to say to me 'You are a baritone who wants to be a tenor'.
"When my father passed away - we had this incredible relationship, especially during his last days - my voice changed and I felt like to sing better. I feel that he did this gift to me in passing. I think I'm a tenor now!' "
The Irish band are close to their families and guitarist The Edge revealed their fathers used to "get drunk" together during their gigs.
Speaking on Italian TV show 'Che Tempo Che Fa?', he said: "Our dads came on tour with us when we were in Chicago, Boston, Philadelphia. They went together to the bar and they got drunk!"
Bono recently admitted he found it "challenging" writing songs for new album 'Songs of Innocence' because all the lyrics, including a tribute to his late mother Iris, were so personal.
He said: "It's challenging stuff. What that meant was nothing, nothing was to be kept back. So you end up with a song about - I mean, how f***ing embarrassing is this? I write the lyrics to a song about my mother.
"It was like, 'Are you gonna go there?' So I went there. Here's a wild thing - my mother collapsed at her father's graveside 40 years ago yesterday and I've just sent out a love song to her.
"It's pretty excruciating stuff."

Matthew McConaughey "carries the audience through" 'Interstellar'.
Producer Emma Thomas insists the Hollywood hunk - who plays lead character Cooper in the film, which follows a team of space travellers as they go through a wormhole - was the perfect protagonist because viewers easily warm to him and he can make the complicated concepts accessible.
She said: "There are some pretty massive concepts that the audience have to deal with in the film, some pretty out there stuff that happens.
"So it was really important that whoever your protagonist is it's somebody that you're with, because they have to carry the audience through.
"Matthew is entirely that guy. You're with him all the way and he carries everyone through."
McConaughey stars alongside Sir Michael Caine, Jessica Chastain and Anne Hathaway in the movie - which is written by brothers Christopher and Jonah Nolan - and Emma is hopeful people will relate to the human story in the film as well as being wowed by the special effects.
She added in an interview with SFX magazine: "My hope is that people will go and see this film and be wowed by the adventure and the look of it and the worlds that they're taken to, but at the same time be emotionally engaged by the much more tangible story that they're watching, that the characters are living through."

Kesha is "prepared to fight" to get Dr. Luke out of her life.
The 27-year-old star, who filed a lawsuit against her longtime music producer this week, claiming he sexually, physically, verbally and emotionally abused her for 10 years, has no plans to back down despite the fact he has filed a countersuit.
The 'Warrior' hitmaker's lawyer Mark Geragos told PEOPLE.com: "We are prepared to fight until he agrees to get out of her life once and for all."
The blonde beauty, who sought treatment in rehab for an eating disorder in January, tried to resolve her issues with him privately before she decided to take their battle to court to ask a judge to dissolve their contract.
Mr. Geragos said: "She's made efforts, [but] she is not a confrontational person. The efforts were always met with psychological warfare, [predatory behavior] and things of that ilk. She finally got to a place where she is surrounded by people that are supportive enough that she felt like she could finally do it, and felt like she needed to do it. She just couldn't go on this way. Getting out of the contract is really secondary to extricating herself from his control."
He added: "I have spent quite a bit of time with her recently and I would say her mindset is as good as I have seen it. Obviously nobody wants to get embroiled in litigation and making things public like this, but she understands she has to take a stand. I applaud her bravery for speaking to a broader societal issue of domestic violence.
"This speaks to an untold story in this industry and society at large."
Dr. Luke - real name Lukasz Gottwald - has denied all of Kesha's allegations, and is suing her for breach of contract and defamation.

Drew Barrymore loves making her husband laugh.
The 39-year-old actress, who has two daughters, Olive, two, and Frankie, six months, with art consultant Will Kopelman, says she feels "the prettiest" when she is entertaining him with her interpretative comedy dances.
The 'Blended' star told PEOPLE magazine: "I feel most beautiful when I'm making my husband laugh with my ridiculous dances."
She added: "I do interpretative comedy dances and he's laughing, and his laugh starts to sound almost like Santa Claus because it's such a high pitched capacity. That's when I feel the prettiest. I can't believe I'm telling you this!"
Drew feels more confident since becoming a mother and insists she has no regrets about any of her red carpet choices in the past.
She said: "It's good to appreciate and remember to not be so hard on yourself because I bet it never looks as crazy as it does in your worried eyes. We have to be nicer to ourselves and we probably look thinner and younger and healthier and happier than we worried about in that moment."
She added: "Never get worried about what people say because it's good to not be afraid. And certainly to not be afraid about what people are going to say."

Glenn Close found it difficult to trust her instincts after being raised in a cult.
The 67-year-old actress spent 15 years in the Moral Re-Armament's conservative religious community in Switzerland, where she lived until she was 22, and admits it had a "profound impact" on her.
The 'Guardians of the Galaxy' star told The Hollywood Reporter: "[For years], I wouldn't trust any of my instincts because [my beliefs] had all been dictated to me."
Glenn's late father, Dr William Taliaferro Close, became enamoured with the spiritual movement - now known has Initiatives of Change - and moved the family to the organisation's headquarters in the small village of Caux, overlooking Lake Geneva, when she was seven.
The six-time Oscar nominee said: "You basically weren't allowed to do anything, or you were made to feel guilty about any unnatural desire. If you talk to anybody who was in a group that basically dictates how you're supposed to live and what you're supposed to say and how you're supposed to feel, from the time you're seven till the time you're 22, it has a profound impact on you. It's something you have to [consciously overcome] because all of your trigger points are [wrong]."
She added: "Many things led me to leave. I had no toolbox to leave, but I did it... I'm not going to go into [the details of leaving]."
The 'Fatal Attraction' star initially suffered from nightmares about betrayal after leaving the group, but has since forgiven her father, as she believes the experience helped make her a better actress.
She said: "I always thought, the way life works, the burden of forgiveness is on the child. I always felt that I was held together with Scotch tape and paper clips, and, as an actor, that's good."

Neil Patrick Harris is set to host the 2015 Oscars.
The 'Gone Girl' actor, who has previously emceed the Tony Awards and the Emmys several times, will present the star-studded 87th annual ceremony at the Dolby Theatre in Los Angeles on February 22.
The 41-year-old star announced the news on Twitter on Wednesday (15.10.14) by posting a video clip of himself telling an unidentified person "I'm in" during a phone call.
The 'How I Met Your Mother' star, who recently married his long-term boyfriend David Burtka, with whom he has four-year-old twins, Harper and Gideon, is then seen consulting his bucket list, which includes having children, getting married and meeting the president, and circling the final item that reads "host the Oscars" with a black pen.
In a statement, he added: "It is truly an honor and a thrill to be asked to host this year's Academy Awards. I grew up watching the Oscars and was always in such awe of some of the greats who hosted the show. To be asked to follow in the footsteps of Johnny Carson, Billy Crystal, Ellen DeGeneres, and everyone else who had the great fortune of hosting is a bucket list dream come true."
Talk show queen Ellen hosted this year's ceremony in March, which scored the best ratings in 14 years, but declined an offer to take on the job again.
'Veep' star Julia Louis-Dreyfus was also offered the role and turned it down, according to The Hollywood Reporter.

Heidi Klum and Seal are officially divorced.
A Los Angeles Superior Court judge finalised the 'Project Runway' star and the British singer's split in Los Angeles on Tuesday (14.10.14) after the former couple, who separated in January 2012 after seven years of marriage, reached a settlement in July.
The judgment did not include any details about the custody arrangement for their two daughters, Leni, 10, and Lou, four, and two sons, Henry, eight, Johan, seven, or how they have divided their assets.
Months after their split, 'Kiss From a Rose' hitmaker Seal accused the German model of cheating on him with her then-bodyguard Martin Kirsten, whom she dated for 18-months until last January.
The 51-year-old star said at the time: "Whilst I didn't expect anything better from him, I would of thought that Heidi would have shown a little more class and at least waited until we separated first before deciding to fornicate with the help.
"But I guess you all now have the answer you have been looking for for the last seven months."
The duo have since put their differences aside and are frequently spotted on outings with their children.
Heidi, 41, has been dating 27-year-old art dealer Vito Schnabel since February.

Selena Gomez claims she is criticised by "grown adults all the time."
The 22-year-old star says "it's hard" being bullied on Twitter, Instagram and Facebook by less accomplished strangers, but refuses "to let them win" by quitting social media.
The actress and singer told E! News: "I get picked on by grown adults all the time. It's grown-ups and I don't get it. It just baffles me. I wish I could just sit them down and say, 'What were you doing at 15? What were you doing at 18? What were you doing at 21?' Because I can guarantee you it's not half of what I've done.' "
She added: "Trust me, it's hard. I've had my moments where I've let them get to me but I refuse to let them win."
The brunette beauty, who has 23.7 million followers on Twitter and 64 million fans on Facebook, admits she might not always want to share her thoughts and photographs online.
She said: "Maybe when I'm older, but I think right now I want to be that person for those girls and for my fans.
"It's nice to be able to connect with my fans. I'm a part of it. I'm totally involved."
Selena formed a close bond with first-time director William H. Macy and his actress wife of 17-years Felicity Huffman on the set of her new movie, 'Rudderless,' and says they are "really refreshing."
She said: "They are not normal in this industry. I've been to their house. I've spent time with them and they just respect each other and they have this beautiful connection through their work...They don't really care about all the noise, which is really refreshing."

Uma Thurman believes she and Arpad Busson can reach a "fair" custody agreement.
The 44-year-old actress's ex-fiancé filed an emergency court order in Manhattan Supreme Court in New York City on Tuesday (14.10.14), seeking custody of their two-year-old daughter, Luna, but she is "optimistic" they can settle their dispute out of court.
In a statement, a spokesperson for the 'Kill Bill' star said: "It is unfortunate that this very private discussion regarding Mr. Busson's visitation rights and his participation in decision making has been made public.
"However, we are optimistic that a fair agreement for both sides will be reached out of court."
Uma got engaged to Arpad, who also has two sons, Flynn, 16, and Cy, 11, with supermodel Elle Macpherson, for the second time in 2011 after calling off their first engagement in 2009, but they ended their relationship for good last April.
The actress, who also has daughter Maya, 16, and son Levon, 12, with ex-husband Ethan Hawke, has since been linked to director Quentin Tarantino.
Earlier this year, the star claimed she was happier than she had been in a long time.
She said: "I'm happier now than I've been in many, many years. I'm trying to live as peaceful a personal life as possible. I guess I'm less jaded now than I've ever been, definitely less than when I was younger."

Iggy Azalea and Snoop Dogg have ended their feud.
The 'Black Widow' hitmaker - who branded the 42-year-old rapper "an a**" after he said she looked like a man without make-up on - accepted his apology shortly after he posted a video declaring a truce between them on Instagram today (15.10.14).
The 'Sweat' rapper told his fans he decided to bury the hatchet with the 24-year-old Australian star after speaking to her manager T.I., saying: "I just got off the phone with my homeboy TIP, the king of Atlanta. It's officially over. No more bad talk. I apologise. I apologise, I'm sorry. I won't do it again."
He also posted the video on Twitter, adding: "It's over I'm bac on my cool s**t no harm no foul (sic)."
Although he never mentioned Iggy by name, she responded on Twitter shortly afterwards, tweeting: "I appreciate the apology @snoopdogg"
She added: "Let that be that people, time to focus on the positive things I've got going on. no time to dwell on the negative."
Snoop's public apology comes just one day after their feud escalated and he warned her she was "f**king with the wrong" guy.
The 'Gin and Juice' hitmaker posted an angry video about Iggy online yesterday (14.10.14), in which he said: "Say, b***h, you're f**king with the wrong n****, and your n**** better check you before I do. You funky b***h. Yeah, you. F**king c**t."
Her boyfriend, Nick Young, later brushed off Snoop's rant and accused him of going through a midlife crisis.
He tweeted: "Ain't nobody worried about no SnoopLion .. This dude Just goin thru a midlife Crisis you Go get convertible yet . OG's out here losin (sic)"

Ashton Irwin has been hospitalised with appendicitis.
The 5 Seconds of Summer star underwent surgery for the condition at a medical facility in his native Australia yesterday (14.10.14), and the band have cancelled a number of upcoming appearances to give him time to make a full recovery.
The 'She Looks So Perfect' hitmakers announced the news on their website today (15.10.14), writing: "Ashton has come down with a case of appendicitis and had to have an operation. He's doing great and will be back up & running in no time, but he'll need to rest up for the next week or so.
"Unfortunately this means that we'll no longer be able to fly back to the UK this weekend for the BBC Radio 1 Teen Awards. We will also be postponing next week's trip to Japan (more info to come soon). We are so sorry to everyone that had planned on seeing us. We were so excited to come see you all and we never want to make any of you sad... We hope you understand!"
The 20-year-old drummer appears to have been struck down with the illness very suddenly, as he said he was having a great time at home on Twitter yesterday.
He wrote: "Love you Aussies, good to be home, havin a blast xx (sic)"
While the group will miss the upcoming Teen Awards, The Vamps, Ariana Grande, Rixton, Ella Henderson and Labrinth will be performing at the annual event, with some artists performing extended sets.

Harrison Ford has become a lifetime member of a British flying club.
The 72-year-old actor, who got his pilot's licence 19 years ago and owns approximately 11 private planes in Los Angeles, including a luxurious G4 jet, has joined Shropshire Aero Club in the West Midlands of England so he can rent aircraft and take to the skies while he shoots 'Star Wars: Episode VII' in London.
Chief instructor Bob Pooler said he received a call from the legendary star "out of the blue" and delivered a plane from Sleap Airfield to Denham close to Pinewood Studios for the actor on Sunday (12.10.14).
He told BBC News: "I checked Harrison out, flew around the patch with him and made sure he was legal to fly and that's it.
"We talked about Star Wars among other movies."
He added: "To rent the airplanes from Sleap you have to become a member and Harrison paid his membership dues until the end of the year.
"I asked him, 'can we make you a temporary member of the aero club?' and he said 'I don't want to be a temporary member, I want to be a lifetime member.'
"I proposed that to the committee at the aero club and of course, without hesitation they said let's make him a lifetime member.
"He's got an open invitation to visit us at any time.
"He's also invited me to visit his place in California."
Harrison developed an interest in flying when he was a teenager but only got his pilot's licence when he was 53.
He previously said: "I never lost the ambition to fly. I just hadn't found the time."
He added: "In my life I have two roles. One of them everyone knows about. It provides a means to the other, which I prefer."