U.N.V.
Universal Nubian Voices
Songs: So In Love With You

U2
Bono, The Edge, Adam Clayton & Larry Mullen Junior
Songs: Christmas (Baby, Please Come Home) - The Saints Are Coming (& Green Day)

UB40
Ali Campbell
Songs: Red, Red Wine - I Got You Babe (& Chrissie Hynde) - Kingston Town - I'll Be Your Baby Tonight (& Robert Palmer) - Can't Help Falling In Love

UFO
Songs: Doctor Doctor - Lights Out

UglyDolls
Songs: Broken & Beautiful (Kelly Clarkson) - Girl in the Mirror (Bebe Rexha) - Unbreakable (Janelle Monáe & Kelly Clarkson)

Uncle Kracker
Songs: Drift Away (feat. Dobie Gray) - Smile - Follow Me - In a Little While - Good To Be Me (feat. Kid Rock)

Carrie Underwood
See also: American Idol & Artists Stand Up To Cancer
Songs: How Great Thou Art - Somethin' Bad (& Miranda Lambert) - Before He Cheats - Mary, Did You Know? - Mama's Song

Keith Urban
See also: The Ranch
Songs: Blue Ain't Your Color - One Too Many (& Pink) - Somebody Like You - You'll Think Of Me - God Whispered Your Name

Uriah Heep
Songs: July Morning - Stealin' - Lady In Black - Easy Livin' - Sympathy

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

Usher
Songs: Yeah! (feat. Lil' Jon & Ludacris) - U Got It Bad - Lovers And Friends (feat. Ludacris, Lil' Jon & The Eastside Boyz) - Same Girl (& R. Kelly) - Love In This Club (feat. Young Jeezy)