The Anatomy of a Fugue - An outline of the substantials of a fugue based on Hugo Norden's "Foundation Studies in Fugue." Topics include counterpoint, subject, answer, and stretto.
AP Music Theory - Information about studying for and taking the advanced placement music theory exam.
Fred Lerdahl's Attack on Serialism - Discussion of Lerdahl's published article "Cognitive Constraints on Compositional Systems", which explores the relationship between composing and listening.
Fundamentals of Raga - Introduction to the Indian modal form known as "rag" or "raga".
Gary Ewer's Easy Music Theory - Includes 25 lessons on music theory, including scales, transposition, intervals, and score formats.
Music Theory Online - An interactive internet course for learning music fundamentals. Designed to be a high school AP course or freshman college level remedial theory course.
Polytonic Harmony - Allows for the creation of music in multiple, simultaneous keys as well as a practical method of voice-leading these chords.
The Society for Music Theory - Established in 1977 in order to promote music theory as both a scholarly and a pedagogical discipline.
Star Theory - Free preparatory syllabus in music theory and orchestration.
Syntactic Structures in Music - By Tom Sutcliffe. Aims to help students of music theory understand the role of chord progressions in musical structures. Site includes animated demos.
Theory of Music with Ted Kirk - Resources for learning and teaching music theory to grade 5 of the Associated Board (UK).
The Tonal Centre - Tonality - Interactive site for music composers and theorists which explains and demonstrates some of the key concepts of tonality; including chords, scales, cadences, and modulation.