Harmonix is a videogame development company based in Cambridge, MA. The company specializes in music-based games, and is renowned for groundbreaking design innovation.

In 2006, Harmonix was acquired by MTV Networks—a division of Viacom International Inc.—and  set forth to develop the company's most ambitious project to date. Developed by Harmonix and published by MTV Games, Rock Band™ was released on November 20, 2007 and has become a multi-million unit selling, genre-defining music game platform that allows music fans and gamers to interact with and discover music like never before by choosing guitar, drums, vocals, or bass to start a band and rock the world. Rock Band™2, released in September 2008, features improvements on the original, including a robust online multiplayer experience and an unrivaled offering of tracks and downloadable content. In addition, Rock Band 2 became the first game in the industry to allow backwards-compatibility, allowing consumers to take advantage of all content on the original Rock Band game disc and their  downloaded content.

The Rock Band franchise officially surpassed $1billion dollars in North American retail sales in 15 months, according to the NPD Group. Rock Band and Rock Band 2 have garnered more than 50 industry awards and accounted for over 40 million paid individual songs sold via download through the Rock Band platform. Furthering its position as the music video game leader in paid song sales and downloadable content, the Rock Band Music Store now features over 600 songs available to date with new music being added every week.

As previously announced, Harmonix is developing The Beatles™: Rock Band® that will allow fans to pick up the guitar, bass, mic or drums and experience The Beatles’ extraordinary catalogue of music through gameplay that takes players on a journey through the legacy and evolution of the band’s legendary career. The game, published by MTV Games, will be available on 09/09/2009 simultaneously worldwide in North America, Europe, Australia, New Zealand and other territories for the Xbox 360® video game and entertainment system from Microsoft, PLAYSTATION®3 computer entertainment system and Wii™ home videogame console from Nintendo.

In addition, Harmonix and MTV Games announced plans to release Rock Band Unplugged for the PSP (PlayStation®Portable) system simultaneously in North America and Europe on June 9, 2009.

Harmonix prides itself on being at the cutting edge and making its games available on many different platforms.   In the fall of 2007, Harmonix released Phase, an interactive music game for the latest Nano, Classic and 5th generation iPod® that lets users experience songs in an entirely new and unique way. Fans can choose a song in their iTunes® library, and Phase will turn it into a playable game level.

Prior to its acquisition, Harmonix was the developer of Guitar Hero I and Guitar Hero II games,  which were published by RedOctane.  Those games became a shrine to the glory of rock guitar and a fiendishly addictive fusion of music and gameplay. The result, as described by Official PlayStation Magazine, was "ridiculously awesome." The original Guitar Hero (2005) was an Interactive Achievement Awards winner in 5 categories, a Game Developers Choice Awards winner in 2 categories and a nominee for Game of the Year in both. The sequel, Guitar Hero 2 (2006), is one of the Top 10 rated games in the history of the PlayStation 2.

Other Harmonix projects included the acclaimed rhythm-action games, Frequency (2001) and Amplitude (2003), published by Sony Computer Entertainment, that successfully merged real-time music-making with insanely addictive gameplay, as well as The Karaoke Revolution series of titles (2003 to 2005), published by Konami Digital Entertainment, that turned singing into a competitive game and turned the game console into a high-end interactive karaoke machine. In addition, Harmonix developed EyeToy: AntiGrav (2004), published by Sony Computer Entertainment, which was Harmonix's one game outside the music genre.

Harmonix was founded in 1995 by Alex Rigopulos (CEO) and Eran Egozy (CTO), who met while working in the computer music group at the MIT Media Laboratory. Alex and Eran formed Harmonix initially not to develop videogames, but rather to create new ways for non-musicians to experience the unique joy that comes from making music. Before developing videogames, the company created interactive music attractions for theme parks, including Disney's Epcot Center, and other location-based entertainment venues. These exhibits allowed users to improvise music simply by moving their hands in the air. Harmonix's first product, The Axe, was PC software that turned a joystick or mouse into a musical instrument with which anyone could improvise original instrumental solos in real time.