The album opens with a field recording of an open-air marketplace in Istanbul, capturing the everyday sounds in the bazaar, including street vendors, market customers, cell phones, children and traditional music played in the background.

His first album to receive wide release, Altered Realities consists of seven instrumental pieces, combining solo acoustic guitar melodies and live electronics.

Erdem cites electric guitar players such as David Torn and Adrian Belew, Michael Hedges's the acoustic style, Harold Budd and Morton Feldman as specific influences for Altered Realities.

The album includes 5 of his prizewinning electroacoustic pieces which he had performed at prestigious contemporary festivals all around the world along with composers such as Paul Lansky and Morton Subotnick.

His solo sound installation exhibition “Freedom to the Black” has been premiered at ARTER in February 2012 and a book with the same title which includes the CD of the piece has been published.

His album Eleven Short Stories which consists of his solo prepared piano pieces has been released by the American label Innova Records in March 2012.

Other albums of him that have been released in 2012 are Erlik Khan (with Bruce Tovsky), Planet X (with Ulrich Mertin) and Fields and Fences (with Bill Walker) celebrating the American rural west[3] which was featured with a long article in the Guitar Player magazine 2012 Holiday issue.

Outside of his work as an electronic musician and film composer, Erdem has also produced rock, pop and world music albums for artists such as Rashit, Timucin Esen, Mehmet Akbas etc.