In a promising turn of events Harmonix has filed a trademark application for Vidrhythm with the United States Patent and Trademark Office.

Harmonix is working on DLC for Rockband and Dance Central 2. But this action reveals some under-the-radar activity of the popular music-game company.

There's not much to add except to refresh your memory of Harmonix splitting from parent company Viacom last March and laying off many employees. That same month Harmonix CEO, Alex Rigopulos, said he wants to branch away from the music-genre.