Henri Pousseur was 25 when he composed his first piece of electronic music in 1954, in the Cologne radio studios where Karlheinz Stockhausen (with whom Pousseur had a close relationship) had created most of his famous pieces. Early Experimental Electronic Music 1954-61, the seventh and penultimate installment in Sub Rosa’s Early Electronic Series, features Pousseur’s earliest works — his first steps. Pousseur studied at the Academies of Music in Li=C3=A8ge, Belgium, and in Brussels, from 1947 to 1953. He was closely associated with Pierre Froidebise and Andr=C3=A9 Souris. He encountered Pierre Boulez, Stockhausen, and Luciano Berio and thereafter devoted himself to avant-garde research. Pousseur taught in Cologne, Germany, and Basel, Switzerland, and the United States at SUNY Buffalo, as well as in his native Belgium. From 1970 until his retirement in 1988 he taught at the University and Conservatory of Li=C3=A8ge, where he also founded the Centre de recherches et de formation musicales de Wallonie. Sub Rosa has released Pousseur’s work before, but it has never released any of the pieces included here. CD in six-panel digipak with 12-page booklet; includes CD-only track “S=C3=A9ismogrammes II” (1958).