8-Tone Quarto-Modes Concept
   Information with mp3 files, an introduction to the "diminished-major" and its applications.
   http://www.jazcraft.net/8tone.html

A Beginner's Guide to Modal Harmony
   A concise explanation of the Gregorian and Renaissance modes and their development in the Common Practice era.
   http://www.standingstones.com/modeharm.html

A-Natural Atonality
   Claims that atonality is unnatural while tonality is acoustically and historically natural.
   http://www.greenwych.ca/atonal.htm

AP Music Theory
   Information about studying for and taking the advanced placement music theory exam.
   http://apcentral.collegeboard.com/apc/members/repository/52437_apmusiclocked_4324.pdf

Abacci Music Lessons
   Music theory lessons with accompanying MIDI files.
   http://www.abacci.com/music/lessons/default.asp

Auto-Transposer
   Transposes all twelve major keys of chord progressions.
   http://www.autotransposer.com/

Bimodalism
   A contemporary alternative to atonal styles of composition.
   http://www.ubieta.com/bimodalism/

Chordwizard: How Music Works
   A concise summary of important concepts in music.
   http://www.chordwizard.com/theory.html

Creativelab
   Visual representations of music expressed in terms of color. In English, Ukrainian and Russian.
   http://creativelab.kiev.ua/

Dolmetsch: Music Theory & History Online
   Offers a musical dictionary, recorder lessons, instrument information and a composers listing.
   http://www.dolmetsch.com/theoryintro.htm

Dynamic Spectrograms of Music
   Provides a type of spectrogram suitable for understanding the structure of music.
   http://nastechservices.com/Spectrograms.html

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

Essentials of Music Theory
   Summarizes entry-level music theory through advanced topics. Includes beginners' drills.
   http://musictheory.redzeppelin.org/

Fugue No. 17: A-Flat Major
   Introduction to the essential concepts of Schenkerian analysis applied to the Ab Major fugue of Bach's Well-Tempered Clavier, Book I
   http://jan.ucc.nau.edu/~tas3/wtc/i17.html

Fugue Treatises, Analyses and Tools
   Bibliography of fugue analysis research, writings and analysis.
   http://www.kunstderfuge.com/theory.htm

Gems of Compositional Wisdom
   Articles on advanced atonal and serial concepts.
   http://www.cosmoedu.net/DoctorFields/

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

Harmonic Bindings
   A paper about the unification of Janecek's theory of imaginary tones with the two Risinger's principles of functional relations.
   http://www.sweb.cz/vladimir_ladma/english/music/articles/ifsa97.htm

Harmony.org.uk
   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/

Interval and Chord Ear-Training
   This site drills ear-training (aural skills), focusing on the aural recognition of musical sounds, including intervals and chords.
   http://www.auralskills.com/

Modes and Scales in Indian Music
   A historical look at concepts of Indian scales and modes comparing North and South Indian approaches.
   http://chandrakantha.com/articles/scales.html

Music Acoustics
   The science of music. Explanations of how musical instruments work via waves and frequency modulation.
   http://www.phys.unsw.edu.au/music/

Music Theory
   A guide to music theory that including chords, scales, music notation and other music theory topics. Has blog format; includes links as well.
   http://www.musictheoryblog.blogspot.com

Music Theory Help Site
   Intermediate music theory help covering basics through beginning formal analysis and counterpoint.
   http://www.wmich.edu/mus-history/TheoryHelp/TheoryHelp.html

Music Theory Society of New York State
   Provides a forum for the exchange of information and to promote music theory as a scholarly and pedagogical discipline. Site also contains membership and scholarship information as well as open calls for papers.
   http://www.ithaca.edu/music/mtsnys/

Music Theory for the Short Attention Span
   Essential music theory knowledge, briefly explained.
   http://www.folkblues.com/theory/

Music Worksheets
   Downloadable worksheets for elementary and middle school students.
   http://www.musicatschool.co.uk/worksheets.htm

Nuottila
   Online ear training fundamentals site. [Requires Java]
   http://www.nuottila.info/2007/

Pattern Thinking in Music
   Offers visual aid to recognizing musical patterns occurring in melody, harmony and rhythm. Provides online demonstration; requires download.
   http://www.seepatts.com/

Polytempo Music Articles
   Articles by John Greschak. Includes a comprehensive annotated bibliography of polytempo music.
   http://www.greschak.com/polytempo/

Rhythm Exercises
   Notation for drills, rudiments and etudes for practicing rhythm.
   http://www.izap.com/~pinnacle/rhythms/

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

SchenkerGuide
   An introduction to Schenkerian analysis for undergraduate music students. Includes background, working method, glossary and bibliography.
   http://www.schenkerguide.com/

Schoen Musical Notation
   Julius Schoens alternative to traditional musical notation, has music notation documents, reference, and discussion.
   http://www.illuschoen.net/sn/sn.htm

Sight-Reading Rhythmic Patterns
   Rhythmic exercises with accompanying MIDI files.
   http://www.rhythm-patterns.narod.ru/

Simplified Music Chord Theory
   Explains scales and building chords from them.
   http://www.rpsoft2000.com/rps_chordtheory.htm

Skytopia: Music and Art Aesthetics
   Author's overview of how every piece of music, every sound, and every picture can be rated on its own merits outside (as well as inside) human opinion.
   http://www.skytopia.com/project/rating.html

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

Solomon's Music Resources
   Resources for composers, music theorists, and researchers of music, with sound files, papers and compositions.
   http://solomonsmusic.net/

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

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.
   http://www.public.coe.edu/~jcotting/tcmu/

Teoria
   Includes software, books, exercises, and links.
   http://www.teoria.com/

The Ancient Musical Modes
   Ideas regarding the "classical modes" described by Plato and Aristotle.
   http://www.pathguy.com/modes.htm

The Basics of Reading Music
   Online tutorial by Kevin Meixner.
   http://www.notationmachine.com/how_to_read_sheetmusic/readingmusic.htm

The Fugue
   An outline of the fundamentals of a fugue based on Hugo Norden's "Foundation Studies in Fugue."
   http://musik.freepage.de/cpb7079/inhalt.html

The Method Behind the Music
   A resource for music theory, music history, the physics of musical sound, and conducting.
   http://www.numbera.com/musictheory/

The Music Theory Minute
   Online music theory tutorials for beginning students.
   http://www.musictheoryminute.com/

The Musical Intervals Tutor
   Offers interactive music intervals and self-testing.
   http://www.musicalintervalstutor.com/

The Musical Octave
   Thomas Váczy Hightower's study of musical scales. Discuses the meta-physical properties of music and the creation of musical scales from an acoustic and mathematical perspective.
   http://home22.inet.tele.dk/hightower/

The Tonal Centre
   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.tonalcentre.org/

Theory on the Web
   Intermediate music theory review for college students.
   http://www.smu.edu/totw/toc.htm

Tonality Guide
   Fundamentals of tonality and music theory created as an online teaching tool with written and aural examples.
   http://www.tonalityguide.com/

VCU Music Theory Resources
   Music theory and ear training resources from Virginia Commonwealth University.
   http://www.people.vcu.edu/~bhammel/theory/resources/index.html

What is Music - Solving a Scientific Mystery
   Provide information on the book by Philip Dorrell which explains a new scientific theory about music: the super-stimulus theory.
   http://whatismusic.info/

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

eMusicTheory.com
   Java applets designed to help students of music improve their basic music reading skills.
   http://www.emusictheory.com/