During the 1970's, Trythall abandoned the highly chromatic, "avant-garde" style of his works from the '60's in favor of a series of experimental, "musique concrète" works for stereo tape and/or for stereo tape and acoustical instruments. Verse - an hour long multimedia performance for slides, film and tape created around a film by visual artist, Milton Cohen - was completed in 1972 (Excerpt: Verse, an event for slides, film and tape, 1972)
A series of works using acoustic instruments and tape - all of which used "found" musical objects as a text for electronic re-elaboration - followed. The first, Suite for harpsichord and tape, on music by Domenico Scarlatti, was composed in1973. This work was remastered in 2007 and retitled Suite: "Dialogo tra ragione e follia" for Harpsichord and Pre-recorded Sounds. (Examples: Suite: "Dialogo tra ragione e follia" for Harpsichord and Pre-recorded Sounds)
RealAudio 
(256K) Mp3 
(16MB, Complete performance)
His 1975 composition for stereo tape, Omaggio a Jerry Lee Lewis, based upon Jerry Lee Lewis's performance of "Whole Lotta' Shakin' Goin' On", proved to be a forerunner of the ideas of "plunderphonics" and "remixing" which subsequently became popular in the 90's. (Examples: Omaggio a Jerry Lee Lewis, for tape, 1975)
RealAudio (232K)
Mp3
(6.17MB, Complete)
Adapting the idea of elaborating "found" musical objects within a purely instrumental context, Trythall completed his Bolero for four percussionists in 1979. One of his most frequently performed works, Bolero has also been performed as a ballet in Sao Paulo, Washington, Cape Town and Venice. (Examples: Bolero for four percussionists, 1979. Mp3 is complete performance of the first version of Bolero as played by the Gruppo Percussione Ricerca di Venezia)
RealAudio (202K) Mp36.17MB
(complete )
