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| Abacci Music Lessons - Music theory lessons with accompanying MIDI files. |
| Analysis of Masterpieces - Analysis of full-music 20th Century atonal pieces. |
| A-Natural Atonality - Claims that atonality is unnatural while tonality is acoustically and historically natural. |
| The Ancient Musical Modes - Ideas regarding the "classical modes" described by Plato and Aristotle. |
| Atonal Set Calculator - Interactive atonal set calculator for pitch class sets and twelve-tone rows. Enter one or two sets and find normal order, prime form, Forte number, interval vector, and symmetry. |
| Auto-Transposer - Transposes all twelve major keys of chord progressions. |
| A Beginner's Guide to Modal Harmony - A concise explanation of the Gregorian and Renaissance modes and their development in the Common Practice era. |
| Bimodalism - A contemporary alternative to atonal styles of composition. |
| Chaos Music Paper I: Aesthetic Evaluation - Essays explaining computer music theory providing detailed analysis. |
| Chordwizard: How Music Works - A concise summary of important concepts in music. |
| Creativelab - Visual representations of music expressed in terms of color. In English, Ukrainian and Russian. |
| Dolmetsch: Music Theory & History Online - Offers a musical dictionary, recorder lessons, instrument information and a composers listing. |
| Dynamic Spectrograms of Music - Provides a type of spectrogram suitable for understanding the structure of music. |
| eMusicTheory.com - Java applets designed to help students of music improve their basic music reading skills. |
| Eric Weisstein's Treasure Trove of Music - A reference resource on music theory, covering in brief a vast array of topics. |
| Essentials of Music Theory - Summarizes entry-level music theory through advanced topics. Includes beginners' drills. |
| The Fugue - An outline of the fundamentals of a fugue based on Hugo Norden's "Foundation Studies in Fugue." |
| 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 |
| Fugue Treatises, Analyses and Tools - Bibliography of fugue analysis research, writings and analysis. |
| Gems of Compositional Wisdom - Articles on advanced atonal and serial concepts. |
| Good Ear - Online ear training site. |
| Harmonic Bindings - A paper about the unification of Janecek's theory of imaginary tones with the two Risinger's principles of functional relations. |
| 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. |
| Interactive Circle of Fifths - A free music theory tool designed to help musicians interpret chord progressions, easily transpose music to a different key, compose new music, and understand key signatures, scales, and modes. |
| Interval and Chord Ear-Training - This site drills ear-training (aural skills), focusing on the aural recognition of musical sounds, including intervals and chords. |
| Modes and Scales in Indian Music - A historical look at concepts of Indian scales and modes comparing North and South Indian approaches. |
| Music Acoustics - The science of music. Explanations of how musical instruments work via waves and frequency modulation. |
| Music Theory - A guide to music theory that including chords, scales, music notation and other music theory topics. Has weblog format; includes links as well. |
| Music Theory - Covers intermediate and slightly advanced topics in tonal music theory. |
| Music Theory for the Short Attention Span - Essential music theory knowledge, briefly explained. |
| Music Theory Help Site - Intermediate music theory help covering basics through beginning formal analysis and counterpoint. |
| Music Theory Instruction - Online instruction for all musicians beginner or advanced. Covers scales, chordal theory, progression theory, modes and foreign scales. |
| The Music Theory Minute - Online music theory tutorials for beginning students. |
| 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. |
| Music Worksheets - Downloadable worksheets for elementary and middle school students. |
| Musica Theoria - Offers explanation of chords, scales, harmony, tuning systems, counterpoint. Also provides links to ear training sites, news groups and history. |
| The Musical Intervals Tutor - Offers interactive music intervals and self-testing. |
| 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. |
| Nuottila - Online ear training fundamentals site. [Requires Java] |
| Pattern Thinking in Music - Offers visual aid to recognizing musical patterns occurring in melody, harmony and rhythm. Provides online demonstration; requires download. |
| Polytempo Music Articles - Articles by John Greschak. Includes an annotated bibliography of polytempo music. |
| Rhythm Exercises - Notation for drills, rudiments and etudes for practicing rhythm. |
| Ricci Adams' Musictheory.net - Includes introductory and intermediate music theory lessons, ear trainers, and books. |
| SchenkerGuide - An introduction to Schenkerian analysis for undergraduate music students. Includes background, working method, glossary and bibliography. |
| Schoen Musical Notation - Julius Schoens alternative to traditional musical notation, has music notation documents, reference, and discussion. |
| Sight-Reading Rhythmic Patterns - Rhythmic exercises with accompanying MIDI files. |
| Simplified Music Chord Theory - Explains scales and building chords from them. |
| 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. |
| Society for Music Theory - Includes a database of journal article from the SMT Journal. |
| Solomon's Music Resources - Resources for composers, music theorists, and researchers of music, with sound files, papers and compositions. |
| Star Theory - Free preparatory syllabus in music theory and orchestration. |
| 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. |
| Teoria - Includes software, books, exercises, and links. |
| Theory on the Web - Intermediate music theory review for college students. |
| 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. |
| Tonality Guide - Fundamentals of tonality and music theory created as an online teaching tool with written and aural examples. |
| 8-Tone Quarto-Modes Concept - Information with mp3 files, an introduction to the "diminished-major" and its applications. |
| VCU Music Theory Resources - Music theory and ear training resources from Virginia Commonwealth University. |
| Visualizing Music: A Model of Harmony - Visual model of music which geometrically describes relationships in harmony. |
| 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. |
| WholeArts - Music Conservatory - Introductory dialogue for courses in music theory and composition. |