Maybe it's the easy way out, but I think All Songs Considered does a pretty good job, unless you only want to hear angry buzzing music.
Good god, based on your reference in your 70s music blog post I decided for like the sixth time to give that podcast another chance. First thing I hear is raves about how awesome the Kaiser Chiefs and the Streets are, and a guy connected over a tin can trying to participate in a roundtable. No thanks. When NPR tries to be hip it's like me trying to act "street." Ever hear that Bryant Park Project show? Yikes.
DFK, we need to work together to find a better music podcast.
It's a shame that only big public radio organizations can afford the licensing to put out music podcasts.