Tonight, Madison Square Garden will play host to the 50th anniversary celebration of the Allman Brothers Band. Warren Haynes, Derek Trucks, Duane Trucks, Jaimoe, Chuck Leavell and many others will celebrate one of the most treasured catalogs in American music. Check out this clip of the late Gregg Allman chatting and playing "Come and Go Blues" and "Melissa" on Letterman from 1982.