Good Ear Online ear training site. http://www.good-ear.com/

Practical Music Theory Includes software, books, exercises, and links. http://www.teoria.com/

Theory of Music with Ted Kirk Resources for learning and teaching music theory to grade 5 of the Associated Board (UK). http://home.clara.net/tedkirk/theory.html

Polytonic Harmony Allows for the creation of music in multiple, simultaneous keys as well as a practical method of voice-leading these chords. http://www.erols.com/wbeachy/

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. http://musik.freepage.de/cpb7079/inhalt.html

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. http://www.andymilne.dial.pipex.com/

Gary Ewer's Easy Music Theory Includes 25 lessons on music theory, including scales, transposition, intervals, and score formats. http://musictheory.halifax.ns.ca/

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. http://music.dartmouth.edu/~kov/lerdahl/

Ricci Adams' Musictheory.net Includes introductory and intermediate music theory lessons, ear trainers, and books. http://www.musictheory.net/

Star Theory Free preparatory syllabus in music theory and orchestration. http://www.musicarrangers.com/star-theory/

Multimedia Music Theory Tutorial A concise summary of important concepts in music. http://www.chordwizard.com/theory.html

Bimodalism, A New Dimension and Ethos in Harmony Contemporary alternative to atonal styles of composition. http://www.ubieta.com/bimodalism/

WholeARTS Music Conservatory Introductory dialogue for courses in music theory and composition. http://www.wholarts.com/music/ed/intro.htm

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. http://www.harmony.org.uk

Chiasmata Modality An experimental modality. http://www.geocities.com/s_emery/index.html

The Society for Music Theory Includes a database of journal article from the SMT Journal. http://societymusictheory.org

Zeuxilogy A new theory of musical time, developed in the past twelve years by the music theorist Andrei Pogorilowski. http://www.zeuxilogy.home.ro/

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. http://www.mursuky.edu/qacd/cfac/music/mus109entry.htm

AP Music Theory Information about studying for and taking the advanced placement music theory exam. http://www.collegeboard.org/ap/music/index.html

Eric's Treasure Trove of Music A reference resource on music theory, covering in brief a vast array of topics. http://www.treasure-troves.com/music/