Composed in the studios of the INA-GRM and recorded live on stage. Composed 1979, and originally released on LP in 1983. This is a recording of a performance of the piece by the famous trio of electroacoustics. This trio was formed in 1977 with the sole purpose of giving concert performances of electroacoustic music. The members of the TM+ trio are well-known personalities in the electroacoustic community: Laurent Cuniot, Denis Dufour & Yann Geslin). As per Jean Schwarz words:

A chord in E major enriched with the series of the first harmonics establishes the underlying structure at the beginning of the piece. With the completion of the crescendo, there is a movement of clashing short broken-up musical lines. The return of the initial structure is polyphonic: each part is a progressively speeded up or slowed down reading of that structure. Four ascending glissandi are set against four descending glissandi. Part two uses broken up and transformed sound materials and brings them into play: continuous/discontinuous. A sweeping introduction with multiple timbres turns into a rhythmic interplay based on a single material: a universe of machines in an industrial machine factory. After composing an earlier version entitled “Gamma”, which was solely for tape, I felt it was important for me to extend my work on the studio synthesizer to a live performance with on-stage synthesizers: hence the title “Gamma Plus”. This is the recording of that live performance. The Trio of synthesizers enriches and modifies the colour of the harmonic pedal by “pulsing” it and substituting for it. The rhythm of the machines in part two invites the three soloists of the GRM Plus Trio (TM+) to join over the tape. After an inevitable “skirmish” the winner emerges...

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The Trio was founded in October 1977 to give concert performances of electroacoustic music, including the repertoire of works composed in the studio and recorded on tape (played over highly specialized sets of loudspeakers), and works composed for electronic synthesizers or other devices designed for electroacoustical transformation of sounds from traditional instruments. The Trio also carries on experimental work with sound entities picked up by microphones and explores improvisation with the aim of discovering new musical interactions and interrelations specific to non-conventional lute-like instruments. The Triop has performed at many contemporary music festivals (Lille, Metz, Lyon, etc.) has given concert performances in France (including the Cycles Acousmatiques concerts in Paris), has made recordings for television and radio, and has conducted professional and public workshops (Grenoble, SIGMA, CNSM ), etc. In 1980 the Trio was accredited by the French Ministry of Culture for concerts in France. Some of the composers who have had their works performed by the Trio are: Bernard Parmegiani, Jacques Lejeune, Guy Reibel, Jean Schwarz, Philippe Mion, etc. not to mention the members of the Trio itself.