Coverville - a podcast of cover versions
Rock, Pop and Country from the 60s to now. A free podcast with 1033* downloadable episodes. Each episode features the music of 1, 2 or 3+ bands. Majority of the show is covers of the featured bands, with the rest covers by the featured artists. Search function lets you find your favorite artists, both covering and being covered.
Themes vary, including artists born in the same month, original versions of songs best know for their cover (e.g., Proud Mary by CCR is best known for Ike & Tina's version), foreign language versions, etc.
The podcast does not have individual tracks. I recommend playing it on a device or app that allows one button jumping forward 30 seconds or so because it's highly unlikely all the songs in a single episode will appeal.
http://coverville.com/archives/category/podcast/
* Yes, one thousand thirty three episodes dating back to 2004.