This text investigates the fundamental theoretical frameworks and analytical methodologies required to understand and interpret post-tonal music composed after 1900. Philip Lambert, a scholar in music theory, provides a structured pedagogical approach designed for upper-division undergraduate students. The book synthesizes complex musical concepts into a methodical curriculum, utilizing a combination of theoretical explanation, practical drills, and creative composition exercises to ensure student comprehension.

Educators and music theorists frequently cite this text as a standard pedagogical tool for undergraduate theory curricula. Readers note the clarity of the prose and the effectiveness of the structured exercises in demystifying complex post-tonal concepts.