It's Letterman's final week and he's got some very special musical guests.
Legendary Aussie rocker Mark Seymour is back with brand new music and an exclusive Aussie tour
Here are the pick of the gigs happening across Sydney this week.
The Rubens release a brand new single from upcoming album 'Hoops' - and it's a cracker!
It was one of biggest gigs of the year, and a Triple M hand-picked support band was there documenting it all.
Southern Cross Austereo Triple M