U.N.V.
Songs:
So In Love With You

U2
Bono, The Edge, Adam Clayton & Larry Mullen Junior
Songs: Your Song Saved My Life (Sing 2) - Christmas (Baby, Please Come Home) - The Fly - The Saints Are Coming (& Green Day)
Bono, The Edge, Adam Clayton & Larry Mullen Junior
Songs: Your Song Saved My Life (Sing 2) - Christmas (Baby, Please Come Home) - The Fly - The Saints Are Coming (& Green Day)
Álex Ubago
Songs:
Siempre en mi mente - A gritos de esperanza - Sin Miedo a Nada (& La oreja de Van Gogh) - Dame tu aire - Dime si no es amor (feat. OBK)
Ultimate Kaos
Songs:
Casanova
Ultra Naté
Songs:
Free

Uncle Kracker
Songs: Drift Away (feat. Dobie Gray) - When the Sun Goes Down (feat. Kenny Chesney) - Follow Me - Smile - Memphis Soul Song
Songs: Drift Away (feat. Dobie Gray) - When the Sun Goes Down (feat. Kenny Chesney) - Follow Me - Smile - Memphis Soul Song
Undercover
Songs:
Baker Street
The Undertones
Songs:
Teenage Kicks

Carrie Underwood
See also: American Idol & Artists Stand Up To Cancer
Songs: Burn - She Don't Know - If I Didn't Love You (& Jason Aldean) - Poor Everybody Else - How Great Thou Art
See also: American Idol & Artists Stand Up To Cancer
Songs: Burn - She Don't Know - If I Didn't Love You (& Jason Aldean) - Poor Everybody Else - How Great Thou Art

Keith Urban
See also: The Ranch
Songs: Blue Ain't Your Color - Somebody Like You - Wild Hearts - Days Go By - Higher Love
See also: The Ranch
Songs: Blue Ain't Your Color - Somebody Like You - Wild Hearts - Days Go By - Higher Love
Us3
Songs:
Cantaloop (Flip Fantasia)

Usher
Songs: Same Girl (& R. Kelly) - Nice And Slow - You Make Me Wanna - Yeah! (feat. Lil' Jon & Ludacris) - Promise
Songs: Same Girl (& R. Kelly) - Nice And Slow - You Make Me Wanna - Yeah! (feat. Lil' Jon & Ludacris) - Promise
Utopia
Songs:
Love Is the Answer