According to the Internet source given below, Louis Andriessen is a Dutch composer of mostly stage, orchestral, chamber, vocal, and piano works. Born into a musical family, son of composer/organist Hendrik Andriessen (1892-1981), nephew of composer/pianist Willem Andriessen (1887-1964) and brother of composer Jurriaan Andriessen (1925-1996). he studied composition privately with his father between 1953-57 and with Kees van Baaren at the Royal Conservatory in Den Haag from 1957 to 1962, where he graduated with a first prize. He then studied composition privately with Luciano Berio
in Milan and Berlin from 1962 10 1964 and assisted him with the scoring of Passaggio.
||Brief biography by The Living Composers Project