They often feature very obscure gems - like the shrieked original version of I've Got My Mind Set On You… by James Rae; famous after being covered by George Harrison (the most under rated Beatle, who had a great pair of ears. He once brought me back a great single from Chicago - the original It's In His Kiss by Ramona King, as he thought we might be related!).

I didn't even know it wasn't a George song and the Rae version is tremendous; gospel tinged.