When you think of an all-ages venue you might think punk music and kids waving middle fingers at their parents and the establishment. But cultivating a great all-ages audience is really about respect for elders. The Kessler Theater, an always-all-ages venue, is nothing if not reverent toward music's past, and it's the perfect place for young music fans to gain an appreciation for history. To say The Kessler books "legacy acts" would be to give it short shrift; catching the Mavis Staples or Zombies of the world in a 400-person theater is once-in-a-lifetime stuff and a chance for those under-18 music-heads to experience music the way it should be.