U2
Bono, The Edge, Adam Clayton & Larry Mullen Junior
Songs: All I Want Is You - Angel of Harlem - I Still Haven't Found What I'm Looking for (with Coco Freeman) (& Rhythms Del Mundo & Buena Vista Social Club) - New Year's Day - One (with Mary J Blige)

UB40
Ali Campbell
Songs: The Way You Do the Things You Do - (I Can't Help) Falling in Love with You - Homely Girl - Kiss And Say Goodbye - Where Did I Go Wrong

UglyDolls
Songs: Unbreakable (Janelle Monáe & Kelly Clarkson) - Broken & Beautiful (Kelly Clarkson)

Uncle Kracker
Songs: Smile - Good To Be Me (& Kid Rock)

Carrie Underwood
See also: American Idol & Artists Stand Up to Cancer
Songs: How Great Thou Art - Before He Cheats - Something in the Water - Cowboy Casanova - The Girl You Think I Am

Upchurch
Songs: Holler Boys

Urban Cookie Collective
Songs: The Key the Secret

Keith Urban
See also: The Ranch
Songs: Messed Up as Me - To Love Somebody (live) (Grammy Awards) - One Too Many (& Pink) - I Can't Stop Loving You - Days Go By

Uriah Heep
Songs: Lady In Black

USA For Africa
Michael Jackson, Lionel Richie, Harry Belafonte, Quincy Jones, Kenny Rogers, Tina Turner & Diana Ross
Songs: We Are the World

Usher
Songs: Superstar - Risk It All (& H.E.R.) - Same Girl (& R. Kelly) - Lovers And Friends (& Ludacris, Lil' Jon & The Eastside Boyz) - Without You (David Guetta)