1x16 - How to Rock

The Perfs have front row seats for a Cee Lo Green concert; Gravity 5 can't get tickets. Masquerading as arena employees, Gravity 5 sneaks into the concert through the back way, but when security catches on, they have to run for their lives. Cee Lo Green decides he wants Gravity 5 to tour with him. But there's a misunderstanding - the star only wants Kacey. Gravity 5 is happy for Kacey, but the Battle of the Bands is approaching and now they have no singer.