His music often has a meditative and emotional and spiritual context, which induces deep feelings of introspection in listeners.
Over his long career, he has collaborated extensively with other notable ambient composers such as Klaus Wiese, Oöphoi, Alio Die, and Tomas Weiss.
Mathias Grassow played drums and guitar in the 1970s and moved on to keyboards in the early 1980s.
He became interested in overtone and subharmonic chants, long deep synthesizer drones, and in Indian classical music.
[2] Later he was influenced by the singing bowl sound recordings of Klaus Wiese.