Led Zeppelin Deep Purple Yes Pink Floyd Queen [Early] Genesis Rush The Doors The Beatles The Rolling Stones (can't believe no one else has said them!) The Eagles ELP GnR Focus (A great Dutch prog band from the 70s) Boston
Oh ayh another great old band is AC/DC they alot of really wicked tunes. But at the same time they alot of bad stuff too. But overall they are still great and i would buy a greatist hits album of theirs.