January 25 will be the last day that Harmonix releases new DLC songs for Rock Band 4, its music/rhythm game that it's supported with new content for nearly a decade. Launching five years after Rock Band 3, Rock Band 4 came out at a time when the music/rhythm game craze had largely passed. While it failed to generate nearly as much interest as its predecessors, it did still manage to find some success and a dedicated fanbase.