U2 performed twice on the opening night, once from the roof of 30 Rockefeller Plaza and later acoustically from the guest couch.
Lady Gaga performed the title track from her latest, ARTPOP.
Arcade Fire brought out all of the silver suits in their wardrobe for "Afterlife."
Country superstar Tim McGraw debuted a new song called "Shotgun Rider."
Guitar hero Gary Clark, Jr. played "You Saved Me" on Letterman.
Phantogram played two songs from their new album, Voices, which was released this week.
Silversun Pickups played their new single, "Cannibal," and 2007's "Lazy Eye" on Jimmy Kimmel Live.
Last but certainly not least, Brian Williams (feat. Lester Holt) delivered "Rapper's Delight."