Manchester Orchestra celebrated the release of their new album, Cope, by playing the title track on Letterman. Letterman celebrated by announcing his impending retirement.
Regrouped bluegrass trio Nickel Creek performed their song "Destination" on the Tonight Show, and also produced a web exclusive about the writing of the song "Helena."
Licensed party-starter Pitbull played "Wild Wild Love" with GRL on the Tonight Show.
Wiz Khalifa brought a song to Arsenio that was more recent than 1994.
Lyle Lovett represented his state when Conan spent the week in Texas.