harmonix music systems - online puzzles

Harmonix Music Systems, Inc., doing business as Harmonix, is an American video game development company based in Cambridge, Massachusetts, best known for its music video games.

Harmonix is perhaps best known as being the developer of Dance Central, Rock Band and Fantasia: Music Evolved, as well as being the original developer of the Guitar Hero series before development moved to Neversoft and Vicarious Visions.