Diego Masson (born 21 June 1935 in Tossa de Mar, Spain) is a French conductor, composer, and percussionist. 　　The son of artist Andre Masson and brother of the singer and actor Luis Masson, Diego Masson studied piano and composition at the Paris Conservatoire. Upon graduation, he joined the Domaine Musical as percussionist and began studying conducting with the group's director, Pierre Boulez. In 1966 he formed Musique Vivante, a group specializing in contemporary music which he still directs (Griffiths and Goodwin 2001). Musique Vivante has introduced many important compositions by French and foreign composers, in particular the music of Boulez and Karlheinz Stockhausen. In 1969 Masson conducted the world premiere of Stockhausen's Stop, which is dedicated to him, and the group also took part in the premieres of "Setz die Segel zur Sonne" from Aus den sieben Tagen and the 1972 version of Momente (Griffiths and Goodwin 2001).