Performed by Ensemble Instrumental de Musique Contemporaine de Paris under the direction of Konstantin
Simonovitch. The instrumentation on Interrupteur is English horn, clarinet, bass clarinet, French horn,
trumpet, violin, viola, cello, two percussions, two electric organs; that on Tautologos 3 is Flute, oboe,
clarinet, trumpet, trombone, viola, cello, double bass, electric guitar, electric organ, vibraphone.
Interrupteur for ten instruments (1967):
Tautologos 3 for eleven instrumentalists and magnetic tape (1970):
Cover photograph (reproduced above) by Luc Ferrari.