Who’s more original than Frank Zappa’s Mothers of Invention? Probably nobody, but the Grandmothers of Invention sure come close. The Grandmothers—Napoleon Murphy Brock, Tom Fowler, Don Preston, Miroslav Tadic and Christopher Garcia—formed in 2002 when four alumni from Zappa’s band were invited to perform classic Zappa material. Since, they’ve been living, breathing and truly reincarnating Zappa’s eclectic and tricky musical scores, and doing more than just playing the same notes all over again. Help them keep Zappa’s music alive Friday, July 27, at the Mystic Theatre. 23 Petaluma Blvd. N., Petaluma. 8:30pm. $22—$25. 707.765.2121.