| Music Awareness | | Tools for learning music theory and harmony principles experientially. Simplified terms and notation. |
| Music Theory Instruction | | Online instruction for all musicians beginner or advanced. Covers scales, chordal theory, progression theory, modes and foreign scales. |
| Music Theory Online | | Offering a musical dictionary, recorder lessons, instrument information and a composers listing. |
| Musica Theoria | | Offers explanation of chords, scales, harmony, tuning systems, counterpoint. Also provides links to ear training sites, news groups and history. |
| Pattern Thinking in Music | | Offers visual aid to recognizing musical patterns occurring in melody, harmony and rhythm. Provides online demonstration; requires download. |
| Polytonic Harmony | | Allows for the creation of music in multiple, simultaneous keys as well as a practical method of voice-leading these chords. |
| Rhythm Exercises | | Notation for drills, rudiments and etudes for practicing rhythm. By Nick Marshall. |
| 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. |
| 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. |
| Star Theory | | Free preparatory syllabus in music theory and orchestration. |
| 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. |
| 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. |
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