探讨人类发展。嘿咻

　　Lecture 1 - Musical Phonology 　　Lecture 2 - Musical Syntax 　　Lecture 3 - Musical Semantics 　　Lecture 4 - The Delights and Dangers of Ambiguity 　　Lecture 5 - The Twentieth Century Crisis 　　Lecture 6 - The Poetry of Earth