(Piano/Vocal/Guitar Songbook). One of the highest grossing musical comedies of all time, Pitch Perfect tells the story of The Barden Bellas, an all-girl college a cappella group, as they compete against another group from their college to win Nationals. Here are 11 songs and mash-ups from the popular soundtrack: Bellas Finals * Bellas Regionals * Cups * Don't Stop the Music * Let It Whip * Party in the U.S.A. * Right Round * Since U Been Gone * Trebles Finals * and more.