Given on February 15th 1972 at the Institute of Contemporary Arts, London.
This is the first part of the lecture entitled "Live Electronic Music and Intuitive Music"
Mikrophonie is the title given by Karlheinz Stockhausen to two of his compositions, written in 1964 and 1965, in which “normally inaudible vibrations . . . are made audible by an active process of sound detection (comparable to the auscultation of a body by a physician); the microphone is used actively as a musical instrument, in contrast to its former passive function of reproducing sounds as faithfully as possible"