We love to attend concerts at the OOB Pavilion (OOB is short for our town, Old Orchard Beach). It's located at Union Ave & Sixth St, which isn't a far walk from many of the area's motels near the beach (maybe 1/2 mile depending on where one is staying). The music tends to be classical/brass/jazz, and some area choruses. The Portland Symphony Orchestra played there in June and that was my favorite concert there to date. The acoustics are good and it's not hard to find a good seat. Tickets are reasonably priced, it just depends on the event. They tend to range from $5-$22, and sometimes they're free. If you don't feel like walking, you can park at the high school parking lot and there's a free shuttle bus service there.