Re: Bah!
Is the BBC show you're on about 'Mastertapes'? Each episode had an A side and B side aired on consecutive days. The first where they were interviewed and played a bit - the second where they answered questions from the audience and played a bit more. I think all still sitting on the iPlayer.
Radio 4 have surprisingly good music programmes sometimes. It's an odd station. There's a lot on there that I don't like, but I'm always being surprised and coming across something totally odd, that's also great. There was a series a couple of months ago on musical instrument makers, or 'Tales from the Stave' where they discuss the history of a piece of classical music and composer over the original manuscript.
Plus I'm Sorry I Haven't a Clue, More or Less and Infinite Monkey Cage.