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

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

Texas Institute of Theory - Devoted entirely to the promulgation of music theory in the Western European tradition.

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.

Musical-Theory.com - Straightforward music theory.

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.

MusicTheory.net - Includes introductory and intermediate music theory lessons, ear trainers, and books. Requires Flash.

Star Theory - Free preparatory syllabus in music theory and orchestration.

CmajMusic - Bravo Notes - An interactive study of music theory and composition with the opportunity to compose. For all ages.

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

The Musical Intervals Tutor - A study aid to help you learn the sounds of the basic musical intervals from minor second to perfect octave.

Musica Theoria - Theory of scales, chords, and progression. Also contains links and other information dealing with music theory.

The Basics of Reading Music - Online tutorial by Kevin Meixner.

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.

The Society for Music Theory - Established in 1977 in order to promote music theory as both a scholarly and a pedagogical discipline.

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.

Music Theory Instruction Reviews - Reviews of training available online.

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.

Music and Theory: Harmony, Dissonance, and Tonality - Short essay.

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.