Last fall, Calvin Harris released his third full-length album, Motion, which featured a song with Tinashe called “Dollar Signs”. At the time, Harris admitted that he’d submitted some tracks to Rihanna to be considered for her rumored eighth LP, one of which — also featuring Tinashe on demo vocals — has just leaked. “5 AM” is a guitar-driven electropop blast of energy that would’ve fit in nicely on the Scottish producer’s own album.