formats and track listings cd single digital download digital ep credits and personnel ; recording recorded at studio wishbone , los angeles , california ; personnel demi lovato -- songwriting , lead vocals john fields -- songwriting , production , bass , guitars , keyboards , programming , recording , mixing will owsley -- guitars , synthesizers , background vocals dorian crozier -- drums michael bland -- programming tommy barbarella -- synthesizer ken chastain -- percussion , programming paul david hager -- mixing credits are adapted from the here we go again liner notes .