Session Americana (Boston) is a rock band in a tea cup or a folk band in a whiskey bottle. This band/collective of talented musicians crafts a musical experience unlike any other. On stage is a collapsible bar table wired with microphones, a vintage suitcase recast as a kick drum, an old Estey field organ, a pre-war parlor guitar, a mandocello and all of its smaller siblings, a harmonica case fire-damaged when Jack’s bar went up in flames and graffitied by Depeche Mode roadies, and an assortment of other instruments that get passed around in this freewheeling modern hootenanny. The anything-could-happen feel of a Session show depends on craft that’s not accidental or easily won; they bring a kind of ease and genuineness to this timeless music, sometimes presenting the latest batch of original songs, reaching back into depths of the American “song bag.” $25