Paul Flaherty, an alto-saxophonist and half of the Paul Flaherty/Bill Nace Duo, has been playing and self-releasing jazz and rock albums since the ‘70s. After joining Bill Nace, an energetic guitar player and Kim Gordon’s post-Sonic Youth bandmate, the two have created a modern jazz/rock group. The band has an experimental and free-improvisational style, as heard on 2007’s An Airless Peace. With opening acts the OOO Trio and Human Adult Band, the Paul Flaherty/Bill Nace Duo will perform on Aug. 31 at the Stanhope House in Stanhope.