The easiest way to visualize the upcoming concert with Tim Bluhm, Andy Cabic and Johnny Irion is a three-part Venn diagram. In one circle, Bluhm (the Mother Hips) overlaps South Carolina native Irion in his band U.S. Elevator, co-writing and contributing guitars and vocals to the group’s 2015 self-titled debut. In another circle, Cabic (Vetiver) overlaps with a producer credit on Irion and his songwriter wife Sarah Lee Guthrie’s 2011 album Bright Examples. Of course, Bluhm and Cabic overlap due to the sheer number of times they’ve crossed paths in their Bay Area–based careers, and now all three get to share a stage when they play on Wednesday, Sept. 14, at Sweetwater Music Hall, 19 Corte Madera Ave., Mill Valley. 8pm. $17-$20. 415.388.3850.