Watch GRAMMY Artist Performances From Live On LettermanKaty Perry, Adele, Coldplay, Wilco and other 2012 Grammy nominees perform Live on Letterman.
Katy Perry Webcast Tonight At 8PM

More From CBS Philly

Win a Trip to Las Vegas To See Britney Spears
GRAMMY’s Fly Away Trip To LA
Best 24 Hour Diners In Philadelphia

Listen Live