https://wccftech.com/epic-games-has-acquired-harmonix-studio-will-now-work-on-fortnite/

Harmonix, the Boston-based game studio known for music game series like the original Guitar Hero, Rock Band, Dance Central, and more recently FUSER, has been acquired by Epic Games. Details on the transactions were not disclosed at this time.

The studio will focus next on delivering musical journeys and gameplay for Fortnite, even though Harmonix still plans to support Rock Band 4 and FUSER going forward according to the official FAQ.