sentence: track listing digital download personnel songwriting -- max martin , shellback , savan kotecha , tiffany amber production -- max martin , shellback recording -- max martin , shellback , michael ilbert mixing -- serban ghenea mix engineering -- john hanes assistant mix engineering -- tim roberts drums , guitar and bass -- shellback keyboards -- max martin vocals -- allison iraheta mastering -- tom coyne source : sales other versions iraheta recorded a version of the song in spanish , named '' el viernes te olvido yo '' ( '' friday i 'll forget you '' ) , which was leaked online in early november .