Listen to the National play “Sea of Love” and "I Need My Love" on "Fallon."

Ryan Lochte and David Letterman had an interesting conversation and other highlights from late night shows.

Watch the Roots tear through "I Declare War" with Ghostface Killah on "Late Night."

Hear the first new Deerhunter song, 'Monomania,' from their next album.

Janelle Monáe and the Roots covered Jimi Hendrix's "Little Wing" on "Fallon" last night.

This may change your life and will probably bring you to tears.

Sigur Rós played the title track to their new album, "Kveikur," on "Late Night with Jimmy Fallon."

Selena as transgendered Wario was a nice touch.

Watch Justin Timberlake and Jimmy Fallon perform "History of Rap, Vol. 4."