condition (tapes/box/inserts): EX / VG+ / EX Amazing document: two reel to reel tapes with electro-acoustic compositions dated 1967-1969, by François Bayle and Beatriz Ferreyra on one and by Guy Reibel and Bernard Parmegiani on the other, made at GRM (by Parmegiani apparently) and destined to be used for public or private listening, in this case composer Franca Sacchi's electronic music listening sessions in Milano around 1969/1970. These tapes predate the public release of these compositiona on record, on Philip's landmark "Prosepectives 21e Siècle"!, and one of the two Ferreyra pieces was eventually released for the public only more than 45 years later! The tapes comes in a white box, one of them bearing Sacchi's address label pasted on, and are accompanied by 6 cyclostyled pages with notes on the pieces in French plus 2 typewritten pages with the translation of the notes in Italian.