Pierre Boulez - Ensemble Intercontemporain, BBC Symphony Orchestra - Rituel / Eclat / Multiples

Previously released on LPin 1983.
Track 1 recorded in November 1976 at Henry Wood Hall, London.
Tracks 2 & 3 recorded in Paris (IRCAM), December 1981, in connection with the Festival D'Automne (Pierre Boulez Cycle).
Rituel for orchestra in 8 groups, was composed in 1974-1975.
Éclat / Multiples was composed between 1965 and 1971 (Multiples being unfinished at the time of recording), and requires 15 instrumentalists for Éclat and 25 for Multiples (same instrumentation as Éclat with the addition of 10 violas).
According to Boulez's indications, Multiples must not be performed alone.
This recording was enhanced using 20-bit technology for "high definition sound".