A short video showing some of the loudspeakers used in the nowadays Acousmonium of the GRM:
p. 127 …..sofferte onde serene… by Luigi Nono
Again a piece, which can hardly be documented by a video, since it uses loudspeakers underneath the piano and loudspeakers in the concert hall.
…..sofferte onde serene… (1976) by Luigi Nono:
and part II:
p. 125 Focused Loudspeakers by Composers Inside Electronics
p. 110 Travelon Gamelon by Richard Lerman
Travelon Gamelon (1977) by Richard Lerman is using piezo-ceramic disks as contact microphones. Many of his works use transducers and his website is a very valuable resource on using these, including a guide for making these microphones.
p. 91 Bird and Person Dyning by Alvin Lucier
Bird and Person Dyning (1975) by Alvin Lucier
p. 20 Drie Ideofonen by Dick Raaijmakers
Drie Ideofonen (1969-1973) by Dick Raaijmakers
Ideofoon 1
Ideofoon 2
Ideofoon 3