Rainer Riehn (12 November 1941 – 9 June 2015) was a German composer and conductor, and a co-editor of music theory magazines.
Riehn was born in Danzig, Germany (modern Gdańsk, Poland) studied music theory in Mainz, Zürich, and Berlin and composition with Gottfried Michael Koenig in Utrecht.[1] He met the music theorist Heinz-Klaus Metzger at the Darmstädter Ferienkurse in the summer of 1965.[2] In 1968 he founded the Ensemble Musica Negativa,[3] in 1977 the series Musik-Konzepte, which he published until 2003 (together with Heinz-Klaus Metzger).[4] In 1984 Metzger and Riehn received the Deutscher Kritikerpreis as editors of the Musik-Konzepte. In 1987 he was chief dramaturge at the Oper Frankfurt together with Heinz-Klaus Metzger, and initiated the first commission for an opera composition for John Cage (Europeras 1 & 2).