Weezer is having the time of their lives selling out, aren’t they? It sure looks fun. Covering songs based on Twitter suggestions, doing retro performances of their old albums cosplaying as their younger selves, and now joining The Tonight Show’s barbershop quartet for a rousing 1910s-style rendition of “Buddy Holly.†The boys of The Blue Album were joined by Fallon, Chris Tartaro, and Tom Shillue for a barbershop septet. Shouts to the Tonight Show costume department for making or finding all those blazers.