Are You Frank Zappa?

The late, great Frank Zappa makes an appearance on the old TV show "What's My Line?" back in 1971. The guests on the panel have to try and figure out who the mystery guest is based on yes and no questions. I would think his voice alone would give it away but it takes a couple of guesses and eventually he's pegged. He's also there to promote the release of his new movie '200 Motels'.