At the Zal Gaz Grotto Club, enjoy The Paul Keller Orchestra along with vocalists, Olivia Van Goor. Cash bar. Food available. Free parking. No steps. This is a great place to enjoy jazz with friends. The greatest Grotto that ever was!" - President Gerald Ford. Good Fellowship in Ann Arbor since 1911. The Zal Gaz Grotto is a social club for the Masonic Fraternity AND the public's home for great music and food!  Come hungry and thirsty and ready to dig into the swinging sounds of the PKO. The Paul Keller Orchestra is one of Michigan's finest, oldest, most-respected and well-traveled jazz big bands.