Umphrey’s McGee bookended its three-night stand at San Francisco’s Great American Music Hall by sparring with a pair of well-known keyboardists. On Friday night, Disco Biscuit Aron Magner, who opened the show along with his new band Conspirator, joined Umphrey’s on keytar for a run through Flock of Seagulls’ ‘I Ran’ at the tail end of the group’s second set. Sunday night, Garaj Mahal’s Eric Levy also aided the Midwest jamband, adding a second keyboard to ‘Slacker.’

Over the weekend, additional drum theatrics ensued: At the beginning of an aptly-titled ‘Ringo,’ Kris Myers’ kick drum gave out, forcing guitarists Jake Cinninger and Brendan Bayliss to switch over to percussion. Quickly fading into a round-robin jam, Cinninger then switched to bass, while Bayliss tried his luck on keyboards. Umphrey’s McGee spring outing will continue tonight, presumably with the group’s classic instrumentation, at Nevada’s Crystal Bay Club Casino.