We all have our favourite songs; perhaps it was a childhood favourite, or a track associated with a particular fond memory. Perhaps it was something that taught you about a different way of life, or a different way of looking at things - either way, it's a deeply personal choice which no one should judge.
That's not going to stop us laughing at Cristiano Ronaldo's selection though.
Enjoy our selection of celebrities' favourite songs; Bob Dylan and The Clash appear twice and David Cameron takes the award for most appropriate selection.
Cristiano...seriously?
(Images: All Star/Rex)
Cristiano Ronaldo
Artist: R Kelly
Song: I Believe I Can Fly
George Clooney
Artist: Dinah Washington
Song: Destination Moon
Ashley Greene
Artist: Counting Crows
Song: Colorblind
Ozzy Osbourne
Artist: Procul Harem
Song: Whiter Shade of Pale
Sean 'Diddy' Combs
Artist: Run DMC
Song: It's Like That
Michael Sheen
Artist: Tim Buckley
Song: Song To The Siren
Boris Johnson
Artist: The Clash
Song: Pressure Drop
Barack Obama
Artist: The Fugees
Song: Ready or Not
Al Pacino
Artist: Rodgers & Hammerstein
Song: You've Got to be Carefully Taught
Kevin Pietersen
Artist: Bon Jovi
Song: We Weren't Born to Follow
Kevin Spacey
Artist: Frank Sinatra
Song: In The Wee Small Hours of the Morning
Danny Baker
Artist: Bernard Cribbins
Song: I've Grown Accustomed to Her Face
Michael McIntyre
Artist: Ella Fitzgerald
Song: Bewitched, Bothered and Bewildered
Michael Johnson
Artist: McFadden & Whitehead
Song: Ain't No Stoppin' Us Now
Mark Ronson
Artist: The Stone Roses
Song: Fools Gold
Tony Blair
Artist: Renee Fleming
Song: Ave Maria
Johnny Vegas
Artist: Johnny Cash
Song: Hurt
Frank Skinner
Artist: The Fall
Song: Rowche Rumble
Rob Brydon
Artist: Bruce Springsteen
Song: Born To Run
David Tennant
Artist: Tim Minchin
Song: White Wine in the Sun
Megan Fox
Artist: The Animals
Song: House of the Rising Sun
Sir Michael Caine
Artist: Frank Sinatra
Song: My Way
Morrissey
Artist: New York Dolls
Song: (There's Gonna Be a) Showdown
Steve Coogan
Artist: Louis Armstrong
Song: We Have All the Time in the World
Piers Morgan
Artist: Dean Martin
Song: Mambo Italiano
Jools Holland
Artist: Stevie Wonder
Song: For Once In My Life
David Walliams
Artist: The Smiths
Song: Please, Please, Please Let Me Get What I Want
James Nesbitt
Artist: Frank Sinatra
Song: Come Fly With Me
Bill Bailey
Artist: Talking Heads
Song: Once in a Lifetime
Bill Nighy
Artist: Bob Dylan
Song: Things Have Changed
Ricky Gervais
Artist: Cat Stevens
Song: Lilywhite
Heston Blumenthal
Artist: Bobby Womack
Song: Love Has Finally Come At Last
Angelina Jolie
Artist: The Clash
Song: Know Your Rights
Frankie Dettori
Artist: The Royal Scots Dragoon Guards
Song: Amazing Grace
David Cameron
Artist: Bob Dylan
Song: Tangled Up In Blue
Matthew Pinsent
Artist: Sting
Song: Fields of Gold
George Foreman
Artist: The Beatles
Song: All You Need Is Love
Gordon Ramsay
Artist: Coldplay
Song: Yellow
Daniel Radcliffe
Artist: Weezer
Song: Buddy Holly
Natalie Portman
Artist: Michael Jackson
Song: Ben