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

UB40
Ali Campbell
Songs: Red, Red Wine - Kingston Town - Can't Help Falling In Love - Blue Eyes Crying In The Rain - Homely Girl

Kali Uchis
Songs: Telepatía - Get You (& Daniel Caesar)

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) - When The Sun Goes Down (feat. Kenny Chesney) - Follow Me - Smile - Good To Be Me (feat. Kid Rock)

Uncle Lucius
Songs: Keep the Wolves Away

Carrie Underwood
See also: American Idol & Artists Stand Up To Cancer
Songs: How Great Thou Art - Drinking Alone - Before He Cheats - Great Is Thy Faithfulness (& CeCe Winans) - Something In The Water

Keith Urban
See also: The Ranch
Songs: Love Songs Ain't for Us (feat. Amy Shark) - One Too Many (& Pink) - That's When (Taylor's Version) (& Taylor Swift) - Be a Light - Blue Ain't Your Color

Uriah Heep
Songs: Stealin' - The Wizard - Gypsy - July Morning - 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: Bad Habits - Same Girl (& R. Kelly) - There Goes My Baby - Lovers And Friends (feat. Ludacris, Lil' Jon & The Eastside Boyz) - Yeah! (feat. Lil' Jon & Ludacris)