In 1950, Schaeffer gave the first public (non-broadcast) concert of musique concrète on the École Normale de Musique de Paris. In Paris in 1951, in what was to turn out to be an essential worldwide trend, RTF established the primary studio for the production of electronic music. Also in 1951, Schaeffer and Henry produced an opera, Orpheus, for concrete sounds and voices. In 1944, earlier than using magnetic tape for compositional purposes, Egyptian composer Halim El-Dabh, whereas still a scholar in Cairo, used a cumbersome wire recorder to document sounds of an ancient zaar ceremony. Using services on the Middle East Radio studios El-Dabh processed the recorded material utilizing reverberation, echo, voltage controls and re-recording.
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