These groups are more intense than most people realize. The kids give up every Saturday to rehearse and perform plus 1-2 rehearsals a week. Precision is demanded but they are required to add artistry to the precision. It's been an interesting process to watch as the kids find the balance.
Andrew is the next to the last marimba (wooden xylophone looking instrument) on the right. He's also the one who crashes the cymbal in the opening to wake up the drummer.