As is becoming more common now a days, the music in the game is actual music composed and performed by real musicians. In this case, it's Swedish musician Lisa Miskovsky. In conjunction with the release of the game on the 11th is a remix EP featuring the song featured in the game, Still Alive, and five remixed versions. My favorite, the Teddybears mix, features a retro Go-Go's beat with the obligatory remix futuristic elements. Check it out below.
Lisa Miskovsky - Still Alive (Teddybears Mix) : Still Alive (The Theme From Mirror's Edge) - The Remixes