Lavengood, Hamm, Gullings, et. al. Open Music Theory
Robert Hutchenson, Music Theory for the 21st-Century Classroom
Andre Mount, Fundamentals, Function, and Form
Catherine Schmidt-Jones, Understanding Basic Music Theory
Tutoring is free for all NYU students enrolled in a core music theory course in the department.
See the link here for more information.
MuseScore: Free open-source music notation program for download that works on any platform. (Comparable to Finale or Sibelius).
Online Metronome: For keeping or finding a tempo
Notio (Interactive Keyboard): Online interactive keyboard that you can set for any scale. Scale degrees/solfege/note names can be added to keys. A great visual tool for improvisation and dictation work!
IMSLP: Largest online database of public domain music scores.
Music Theory for Musician's and Normal People: Handy reference handouts created by Sparky the Theory Dog for various topics.
BandLab: Free open-source online platform for recording, mixing, and collaborating on music projects. Audacity is another good open-source downloadable option that works cross-platform.
HookTheory: Plug in a chord progression and listen to excerpts from pop songs that use that progression.
Groove Pizza: Interactive online tool for experimenting with different grooves in popular music.
aQWERTYon: Jam along with your favorite Youtube recordings on your computer keyboard with different instruments and effects.