Circuit Freq is a music group consisting of Amir Derakh and Anthony Valcic. Both are music producers, programmers, remixers, and engineers, and they have been involved with the Sonic the Hedgehog series.
Circuit Freq is an electro-house and techno artist from the record label Circuit Freq Records (which is also the current record label of Julien-K). As it's common for the electronic music genre, their music often has no lyrics, except for occasional samples. Their music has been remixed several times, which have appeared on albums such as The Best of Circuit Freq Records and the Circuit Freq Records Xtras series.
Involvement with the Sonic series
Circuit Freq appeared on the Blue Blur: Sonic Generations Original Soundtrack, where they remixed Crush 40's "Open Your Heart" for the Perfect Chaos boss and "For True Story" in Sonic Generations. They also contributed to the modern remix of Radical Highway for the Nintendo 3DS version of the game.