Music Business Radio is a blog and podcast. It must be rather new; it has great reviews so far and I find it very interesting.
Recent guests include guitarist John Strohm, publishing mogul Pat Higdon, major video director Chad Denning, songwriter Billy Yates, music publishing consortium "Chicks With Hits". Random songs (I don't know how they are chosen) and reviewed by guests at the end of every show.
This innovative podcast is sponsored by Nashville's radio station "Lightning 100" - WRLT 100.1
If you're listening regular radio (is that even still cool?), the show comes on Sunday nights at 7 pm.