Seven vocal groups including Shir Madness, GW Pitches, GW Vibes, The Sirens, The Voice Gospel Choir, GW Troubadours and Sons of Pitch sang Wednesday at Battle of the A capella, an annual event hosted by Class Council in Lisner Auditorium. The groups were asked to perform three songs of their choosing, as well as a rendition of Carly Rae Jepsen’s hit song, “Call Me Maybe.”