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

CBS3 Country Countdown Ticket Contest
Getaway Guide To Senior Discounts
RMHC Telethon: Bidding For Good

Listen Live