For more than 50 years now, the avant blues act 15-60-75 the Numbers Band has been a singular entity on the local music scene. Band leader Bob Kidney is a compelling frontman who has a poet’s sensibility and plays a mean guitar too. Songs such as the woozy "Narrow Road" are simply mesmerizing. The show begins at 8 p.m. at the Beachland Tavern. Tickets cost $15.