Atonal Set Calculator
- http://ericandchar.com/atonal/
- 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.
Harmony.org.uk
- http://www.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.
SchenkerGuide
- http://www.schenkerguide.com/
- An introduction to Schenkerian analysis for undergraduate music students. Includes background, working method, glossary and bibliography.
The Musical Octave
- http://home22.inet.tele.dk/hightower/
- 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.
The Tonal Centre
- http://www.tonalcentre.org/
- Interactive site for music composers and theorists which explains and demonstrates some of the key concepts of tonality; including chords, scales, cadences, and modulation.