Recording of Julio Roloff's, Quintaesencia. This piece features a wide ambience of frequencies, Roland piano improv, and electronically produced sounds. The frequent changes in energy and direction allow for free flowing ambient sections and intense section with strict rhythm.

This is another in a series of pieces Luening made by recording himself playing flute, and then while listening on earphones, taped a second flute part over the first, and so forth.

Recording of Otto Luening's Invention in 12 Notes.

The work is made around tape recordings of Luening's improvisations on the flute. The flute recordings were transposed through change of tape playback speed and transformed through "tape recorder feedback".

Recording of Pierre Schaeffer's Orphée 53.

Recording of Rune Lindblad's Party.

Recording of Otto Luening's Rhapsodic Variations.

Recording of Otto Luening's Poem in Cycles and Bells.

Recording of Hugh le Caine's Dripsody. It is an study for variable speed recorder. It was composed in one night. Le Caine used a recording of a drop of water falling into a bucket, which he re- recorded different speeds, obtaining the heights of a pentatonic scale. Using 25 connectors and the variable speed tape recorder, it produced thousands of sound effects. Dripsody begins with the original sound of the water drop, repetition loop. Shortly afterwards, by adding more loops, the density of the sound increases and an arpeggio figure is produced. The complete work, lasting one minute and twenty-six seconds, was finished at 7.30 am, and Le Caine played it for those who arrived at the laboratory.

Recording of Hugh le Caine's Ninety nine Generators. The title refers to the 99 organ sound generators sensitive keys - a separate generator for each note of the keyboard that can all be operated simultaneously. Le Caine here uses a resonance pedal and a device that can change the pitch to produce a vibrato or long glissandi impossible to achieve on an organ. The particular reverb of this piece is caused by the unusual acoustics of the place where it was realized.

Recording of Bor Turel's Sonotranjosti.

Recording of Hugh Le Caine's Invocation. The piece opens with a trio of three recorded sounds: a glass that is broken with a hammer, a ping-pong ball hitting a racket, and a drop of water. These sounds are the "instruments" used throughout the piece. Drips are configured as fast ascending and descending glissandi. A series of chords is constructed from a sustained movement of glass stamps. The sound of the ping-pong ball - from the left to the right - gradually accelerates. Severe rumbling and sharp joints appears as sudden changes in channels multiply. The introduction of these gestures disrupts the orderly progression of loops and the inclusion of small strips of paper connected to the ribbon which produces rough and jerky sounds further accentuate this breaking effect. Towards the end of the piece, sustained sounds are played out in a chord, but as soon as this effect is installed, the tape slows down and stops, as if someone had unplugged the music player. Then we hear a particularly violent sound of glass breaking.

Recording of Włodzimierz Kotoński's Etude pour un seul coup de cymbale.