Introduction to Music Theory course online

[torchygirl]

There is a nice, basic introduction to music theory from  online here (contents listed below):

https://cnx.rice.edu/content/col10208/latest/

By: Catherine Schmidt-Jones

Course Content
Pitch and Interval
Octaves and the Major-Minor Tonal System
Half Steps and Whole Steps
Interval
Ear Training
Keys and Scales
Major Keys and Scales
Minor Keys and Scales
The Circle of Fifths
Triads and Chords
Triads
Naming Triads
Beginning Harmonic Analysis
Cadence in Music
Consonance and Dissonance
Beyond Triads: Naming Other Chords