“A Cappella” is a term that means “in the style of the chapel” and is the term used to people singing without musical accompaniment (as the old-time “chapel” singers did back when we had modes and not keys.  But anyway.)  Collegiate a cappella groups, which are comprised of anywhere from 6-20 kids (all male, all female, or co-ed), give concerts where they usually cover fairly popular or well known songs, with no instruments backing them.  A Cappella was very important in my undergrad life, as I had several friends in all of my school’s (three) a cappella groups.  There is a certain counterculture to collegiate a cappella, which Mickey Rapkin captures beautifully in his new book “Pitch Perfect: The Quest for Collegiate A Cappella Glory.”  Granted, he talks more about the history of the Intercollegiate Competition of Collegiate A Cappella (known in the trade as the ICCAs) than talking about the things *I* remember from going to A Cappella shows and after parties (lots and lots of booze, some stoned people, and serenading lucky girls pulled from the audience.)  Still, it has sent me on a frantic downloading frenzy of the likes of Rockapella and The Hyannis Sound.  I highly recommend them.  They may not be in a chapel, but a good a cappella group is something almost religious.