It’s a problem we’ve all faced from time to time — a bunch of friends want to see some live music: One is a jam-band fan, another digs Krautrock (i.e., ’70s German bands Can, Cluster, Amon Duul, etc.), another loves groove-oriented jazz (Charles Earland, Jack McDuff, etc.), and still another hasn’t outgrown ’60s rock (Traffic, Steppenwolf). How to potentially please all these seemingly disparate tastes? Only one band: Mushroom. Actually a collective with a core membership (drummer Pat Thomas, multi-instrumentalist Erik Pearson, bassist Ned Doherty) than a proper band, Mushroom surveys classic rock song structures and freewheeling improvisation, anchored by solid, earthy rhythms. Honorary ‘shrooms include singers Gary Floyd and Alison Faith Levy, guitarist Dan Olmsted, and horn-fellows Ralph Carney and Eddie Gale. Truly trippy.