At the beginning of the film, Gabe's band plays a cover of Fun's "We Are Young" at the graduation party.
Years later, at a bar near the South By Southwest festival, they play the same cover.
They aren't really shown playing original songs elsewhere in the film, and the name of the band is never mentioned. Even when Cara points to a bar sign and says Gabe's band is playing, viewers only see the other side of the sign without the name.