I love that album, and that song, it’s also in my collection. I bought it way back when it was first released.
That’s Capt Beefheart AKA Don Van Vliet on vocals on that song. He was a friend of FZ in the very early days before they were famous back in Lancaster CA. You probably already knew that.
Capt Beefheart is really in my top three favorite artists of all time. Saw Capt Beefheart and his magic band at a little club in Manhattan beach Calif called The golden Bear way back in the day. Awesome show. Sure brings back some great memories.