Here's some groovy news for you: Ever since opening its doors last spring, Goat Head Saloon has become a destination place for fans of jam rock. Every month, this charming Mesa watering hole hosts gigs by bands specializing in the funky, Grateful Dead-style genre, usually featuring extended solos and fits of psychedelic jamming. Groups such as Xtra Ticket, Endoplasmic, and The Noodles perform here regularly, as do such out-of-towners as 3 Ugly Guys and Alfred Howard and the K23 Orchestra. The place evokes the spirit of the old Sail Inn (the infamous bygone east Valley jam-rock hangout), with the usual crowd of granola-munchers and tie-dyed types turning out for shows. It's not all hippies, however, as a varied crowd of rock 'n' roll fans make the trip to Goat Head every week to have a funky time.