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 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/

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/

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

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/

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/

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

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

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

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

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/

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Chaos Music Paper I: Aesthetic Evaluation
- Essays explaining computer music theory providing detailed analysis.
- http://www.freewebs.com/gustavsphinx/

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

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

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

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

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

Music Theory Instruction
- Online instruction for all musicians beginner or advanced. Covers scales, chordal theory, progression theory, modes and foreign scales.
- http://www.angelfire.com/music5/theory/

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/

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

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

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

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/

Musica Theoria
- Offers explanation of chords, scales, harmony, tuning systems, counterpoint. Also provides links to ear training sites, news groups and history.
- http://mywebpage.netscape.com/zentaoguy/

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

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

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

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

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/

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