answer:(1) first round will be very informal. pretty much a cattle call. (2) have a prepared song. a capella of course. (3) callbacks will be informal, but will involve meals, getting to know you sessions, socialization, and songs that you will have to sing both in your part in group, and as a solo. The groups are like sororities. Be concerned about performing well, but more concerned about figuring out if you’re going to want to hang out with these people all the time. Because you will.