The Unanswered Question IV : The Delights and Dangers of Ambiguity
The Unanswered Question V : The Twentieth Century Crisis
Is the Man Who Is Tall Happy?
The Unanswered Question II : Musical Syntax
The Unanswered Question III : Musical Semantics
The Unanswered Question I : Musical Phonology
The Unanswered Question VI : The Poetry of Earth
