Completely revised and expanded edition. The Lexicon of Harmony Theory combines the advantages of a classic textbook with those of a universal reference work for the first time. With over 2500 entries from A to Z and an index. With numerous cross-references, the lexicon answers all questions related to harmony and counterpoint theory while also challenging readers to explore new inquiries. By incorporating additional parameters such as melody, rhythm, and sound, the author successfully establishes broader connections. Numerous musical examples, tables, and specially designed four-color graphics ensure maximum comprehensibility and clarity of presentation. The focus is on orientation towards musical practice - for musicians of all genres from classical to pop music, music students, music teachers, and instructors at music schools.