(b Strasbourg, 1901; d Berlin, 1988).
Ger. critic, author, and composer. Cond. concerts of new mus. in Hamburg, 1923–4. Mus. critic in Berlin 1929–34, when removed by Nazis, and in Prague 1937–41. Head of new mus. dept., Berlin radio, 1946. Returned to Berlin mus. criticism 1947. Prof. of mus. history, Berlin Tech. Univ. from 1948 (emeritus from 1967). Author of books on Busoni, Stravinsky, Ravel, Blacher, and David. His major biography of Schoenberg appeared in 1974 (Eng. trans. 1978).