Epic bought out Harmonix a few years ago, and they had Harmonix work on Fortnite Festival. Harmonix made *Rock Band*. Basically, they made GH1 and GH2, but then another company bought the rights to Guitar Hero, so they went on their own and made Rock Band, which was revolutionary as it had more instruments than just the guitar. So Fortnite Festival is Rock Band, not Guitar Hero, and it's by the creators of Rock Band, who no longer own the rights to Guitar Hero. It would be cool to see some iconic session musicians/stand-ins from the Rock Band games as skins though.