It was a dark and stormy night Wednesday, but Bob and Bill weathered the turbulence outside from inside the studio. Alas, dear listener, so did the gremlins. They played havoc with the gear, and we ended up with something pretty unlistenable.   If the recording had been up to our impossibly high standards, you would have heard us say happy birthday to Rita Coolidge, Little Walter and Judy Collins, who sang Bob’s mother’s favorite song.