I am having a lot of fun listening to a variety of corps recordings here:
Internet Drum Corps Radio
Shows from the 60s to present are being played in streaming format (MPEG Audio Layer-3). With a a late model browser you should be all set. It works with broadband and dial-up connections so don't be afraid to give it a try.
Shows are complete with no one announcing the corps name and year although often the show announcers can be heard at the beginning. I even heard a judges GE tape for Spirit of Altlanta from 1986 at one point!