The Internet Archive had legal gems such as the Jamendo Album Collection, a huge CC haven. Yes, most of it under NC licenses, but for non-commercial streaming radio with podcasts, these have been invaluable.
Do you know Nanowar? They began there.
Also, as commercal music has been deliberately dumbed down for the masses (in paper, not by cheap talking), discovering Jamendo and Magnatune in late 00's has been like crossing a parallel universe.