A cappella singing is hot at the moment following the success of feature Pitch Perfect, about competing college a cappella groups. So American Idol producer 19 Entertainment and its parent company CORE Media Group have signed an exclusive deal with Varsity Vocals, the collegiate a cappella organization that organizes the International Championship of A Cappella, to develop a show built around the competition and the college students who participate in it. I hear Varsity Vocals president Amanda Newman announced the partnership at the ICCA International finals tonight in NYC. Also looking to take advantage of Pitch Perfect‘s success is Universal sibling NBC, which recently announced the revival of its a cappella competition series The Sing Off. Under the 19 Entertainment pact, CORE becomes the exclusive production company with the right to shoot the ICCA competition for TV. Universal just greenlighted a Pitch Perfect sequel after the original movie became a pop culture phenomenon, grossed more than $110 million at the box office, another $90 million in DVD and VOD and spawned a hit soundtrack album.