The Northamptones are an audition-based advanced a cappella group at Northampton High School. They’ve performed all over New England, including at the Academy of Music, John M. Greene Hall, the Calvin Theatre, the Iron Horse, Fenway Park, and the Massachusetts State House. These dedicated students meet every other day for an 85-minute practice period during the school year and they’re ready to thrill you tonight at their CD release performance at the Iron Horse. But you’d better act fast because advanced ticket sales are sold out. There are a limited number of tickets are available on a first come first serve basis at the door. Iron Horse Music Hall, 20 Center St., Northampton.