In the game, a player portrays a virtual avatar called a "FreQ", and travels down an octagonal tunnel, with each wall containing a musical track.

As the player hits buttons corresponding to the note placement on the track, the "sonic energy" from within is released and the music plays.

Frequency was one of the first games to be supported by the PS2 Network Adapter, allowing for up to four players to play against each other as well as to trade their remixes.

Some of the songs are actually "in-house" productions by Kasson Crooker, who served as a musical director for the game and is also a former member of the band Freezepop.

These artists include The Crystal Method, BT, Akrobatik, Chris Child (Kodomo, of Surgecore), Melissa Kaplan, Freezepop, as well as Crooker himself returning with his various pseudonyms.

Hidden within the game's files there are two more songs, named "BT - Godspeed" and "Kareem Caines - Scratchotronic".

This advice indirectly led Harmonix to become involved with Guitar Hero with a custom guitar-shaped controller, and leading to a multi-billion dollar franchise.

[3] Despite the positive reception, Ryan Lesser, an art director at Harmonix, said that Frequency "didn't sell very well".