CASA About CASA Posted by CASA Communications on 01/03/2009 This is CASA: The Contemporary A Cappella Society. CASA was formed to create a community between singers and fans of contemporary a cappella. A cappella was the first music, and has always been an important part of popular culture, from Madrigals to Barbershop to Doo Wop. Now we call it "Contemporary A Cappella" and it covers pretty...