Editing Musique concrète (section)

====Three-head tape recorder====
This original tape recorder was one of the first machines permitting the simultaneous listening of several synchronised sources. Until 1958 musique concrète, radio and the studio machines were [[monaural|monophonic]]. The three-head tape recorder superposed three magnetic tapes that were dragged by a common motor, each tape having an independent [[Bobbin|spool]]. The objective was to keep the three tapes synchronised from a common starting point. Works could then be conceived [[polyphonic]]ally, and thus each head conveyed a part of the information and was listened to through a dedicated loudspeaker. It was an ancestor of the multi-track player (four then eight tracks) that appeared in the 1960s. ''Timbres Durées'' by Olivier Messiaen with the technical assistance of Pierre Henry was the first work composed for this tape recorder in 1952. A rapid rhythmic polyphony was distributed over the three channels.<ref name="Teruggi-2007-p218">{{harvp|Teruggi|2007|p=218}}</ref>