Ok, I finally got my sound card working. Oy
A cappella is also pretty big at my school, but it's nothing like what goes on at Yale and it's not really like rush. You have an audition, some of the more popular groups do callbacks, and they select their new members.
There are only a few a cappella groups, because we had a (stupid) rule that no two student groups could be formed for the same purpose - so if there were, for instance, a gaming club, you couldn't form another one, you were expected to join the existing one. This held true even if the groups were selective in their membership. So we had: the coed group, the all-women's group, the all-men's group, the coed group that would let Wellesley students join, the Christian group, and the Jewish group (the one I sang with) - AND THAT WAS IT. You wanted to form another singing group? Too bad, unless you could make it in some way different from the existing groups.