Brian Campeau is up first, and he’s brought one quarter of his band, The Common Misconceptions, along for support. She, a certain Elana Stone, accompanies on accordion and vocals. Brian Campeau is a folk singer – or at least what he does is grounded in folk; the reality is that the music is a little spacier than all that. It’s partly the reverb and partly his inventive guitar playing style, in which the rhythm is supplemented by harmonics, trills, hammer-ons and surprisingly inventive tapping. He sings four songs, she sings two, and the crowd is entranced.