Good Ear
Online ear training site.

Practical Music Theory
Includes software, books, exercises, and links.

Theory of Music with Ted Kirk
Resources for learning and teaching music theory to grade 5 of the Associated Board (UK).

Polytonic Harmony
Allows for the creation of music in multiple, simultaneous keys as well as a practical method of voice-leading these chords.

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.

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.

Gary Ewer's Easy Music Theory
Includes 25 lessons on music theory, including scales, transposition, intervals, and score formats.

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.

Ricci Adams' Musictheory.net
Includes introductory and intermediate music theory lessons, ear trainers, and books.

Star Theory
Free preparatory syllabus in music theory and orchestration.

Multimedia Music Theory Tutorial
A concise summary of important concepts in music.

Bimodalism, A New Dimension and Ethos in Harmony
Contemporary alternative to atonal styles of composition.

WholeARTS Music Conservatory
Introductory dialogue for courses in music theory and composition.

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.

Chiasmata Modality
An experimental modality.

The Society for Music Theory
Includes a database of journal article from the SMT Journal.

Zeuxilogy
A new theory of musical time, developed in the past twelve years by the music theorist Andrei Pogorilowski.

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.

AP Music Theory
Information about studying for and taking the advanced placement music theory exam.

Eric's Treasure Trove of Music
A reference resource on music theory, covering in brief a vast array of topics.

Rhythm Exercises
Notation for drills, rudiments and etudes for practicing rhythm. By Nick Marshall.

Java Music Theory
Suite of Java applets designed to help students of music theory improve their proficiency at basic music theory skills.

Mr B's Music Tutorial
By a music educator for students, a guide to self study covering music reading, piano, guitar, composers, and music history.

Fundamentals of Raga
Introduction to the Indian modal form known as "rag" or "raga".

Elements of Music Notation
Basic introduction to reading music. Learn note names, clefs, staff, signs. Worksheets and answer keys included.

Harmonic Bindings
A paper about the unification of Janeãek's theory of imaginary tones with the two Risinger's principles of functional relations.

The Basics of Reading Music
Online tutorial by Kevin Meixner.

Gems of Compositional Wisdom
Articles on advanced atonal and serial concepts.

Lunar Calendar Theory of Music
Walter Johnson demonstrates similarities between the DO, RE, MI scale of music and the ancient Athenian lunar calendar of Meton, the Fibonacci rabbit sequence, and the annual spawning cycle of coral.

Technical Committee on Musical Acoustics
A group within the Acoustical Society of America, that concerns itself with the application of science and technology to the field of music. Contains members, a list of papers, acousticians and links.

Solomon's Music Theory and Composition Resources
Resources for composers, music theorists, and researchers of music, with sound files, papers and compositions.

SchenkerGuide
An introduction to Schenkerian analysis for undergraduate music students. Includes background, working method, glossary and bibliography.

Music Theory Online
Comprehensive guide including links to other web resources on related subjects.