The Unanswered Question (Leonard Bernstein, Harvard, 1973)

1.- Musical Phonology
2.- Musical Syntax
3.- Musica Semantics
4.- The Delights & Dangers of Ambiguity
5.- The XXth Century Crisis
6.- The Poetry Of Earth 

Karlheinz Stockhausen: English Lectures (1972-73)

Allied Artists (London, 1972)

1.- Musical Forming
2.- Mikrophonie 1
3.- Moment forming and integration ("Momente")
4.- Intuitive music "ES" (IT)
5.- Four criteria of electronic music ("Kontakte")
6.- Telemusik
7.- Mantra