Rainer Riehn (1941-2015) was a German musicologist, conductor and composer of avant-garde music. He is best known for being the long-time partner and collaborator of Heinz-Klaus Metzger with whom he published the journal Musik-Konzepte
between 1977 and 2003, devoted to the musical avant-garde of all eras. Together, they also founded the Ensemble Musica Negativa in 1969, committed to radical music by John Cage
, Morton Feldman
, Dieter Schnebel
, a.o., for which Riehn served as the conductor and organiser. Nevertheless, his own small but impressive compositional œuvre of chamber and electronic music remained mostly unpublished.