Career
Following a period of studies at the Hochschule für Musik und Theater München and in courses given by Hermann Scherchen in Gravesano, Riedl, influenced by Carl Orff und Edgar Varèse, devoted himself as a composer particularly to percussion and Lautgedichte (sound poetry) (Schmidt 2001). Starting in 1952 he did pioneering work in the use of concrete and electronic sounds, joining Pierre Schaefer’s Groupe de Recherche Musicale in 1953 (Schmidt 2001). In 1955 he worked in the electronic studio of NWDR in Cologne, and spent some time in 1959 in Scherchen’s experimental studio in Gravesano (Schmidt 2001).
From 1959 until its closure in 1966 Riedl was director of the Siemens Studio for electronic music (Schmidt 2001).
The concert series Neue Musik München / Klang-Aktionen initiated by Riedl in 1960 (Schmidt 2001) continues to this day. In 1967 he established the Musik/Film/Dia/Licht-Galerie group, and in 1974 in Bonn founded the Kultur Forum, which he directed until 1982 (Schmidt 2001).
Lentz currently performs as saxophonist in Riedls" ensemble. Riedl also contributed to film music, for example to several episodes of the 13-part Die zweite Heimat—Chronik einer Jugend (1992), the second in Edgar Reitz"s Heimat series (IMDb credits).