Mattias Gustafsson has been played over 10 times on NTS, first on 6 February 2017. Mattias Gustafsson's music has been featured on 10 episodes.

Mattias Gustafsson (born 1978) is a sound artist from Mjölby, Sweden that has been releasing music as Altar Of Flies and his given name since 2006. He mostly works with magnetic tape and various instruments & electronics. His music is influenced by the electroacoustic music of the 1900´s and the millennium noise underground. He has released records on labels such as iDEAL, B.A.A.D.M., Järtecknet etc.