U2
Bono, The Edge, Adam Clayton & Larry Mullen Junior
Songs: New Year's Day - Angel of Harlem - City Of Blinding Lights - One (with Mary J Blige) - Stuck in a Moment You Can't Get Out of

UB40
Ali Campbell
Songs: Blue Eyes Crying in the Rain - Homely Girl - If It Happens Again - (I Can't Help) Falling in Love with You - Every Breath You Take (50 First Dates)

Ultravox
Songs: Vienna

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

Carrie Underwood
See also: American Idol & Artists Stand Up to Cancer
Songs: Before He Cheats - How Great Thou Art - Summer of '69 (live) - Something in the Water - Cowboy Casanova

Keith Urban
See also: The Ranch
Songs: Messed Up as Me - Start A Band (& Brad Paisley) - To Love Somebody (live) (Grammy Awards) - 'Til Summer Comes Around - Once In A Lifetime

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

Usher
Songs: DJ Got Us Fallin' In Love (& Pitbull) - The Christmas Song (Chestnuts Roasting On An Open Fire) (& Justin Bieber) - Superstar - Glu - Without You (David Guetta)