"The fact that we can still harmonize after fifty years – it's quite a reunion!" says Brian Wilson of the Beach Boys' 50th anniversary celebration, including a massive tour and their new album, That's Why God Made the Radio, which just debuted at Number Three on the Billboard 200 – the group's best chart debut ever. Check out this exclusive clip, "A Signature Harmony," which delves into the Beach Boys' signature meticulous vocal arrangements and includes interviews with band members and behind-the-scenes footage as well.