Music Theories

  Electronic Music Interactive
http://nmc.uoregon.edu/emi/
 

Gary Ewer's Easy Music Theory
http://www.musictheory.halifax.ns.ca/
 

Ricci Adams' MusicTheory.net – Animated Music Theory Lessons
http://www.musictheory.net
  Learning Musical Elements through Listening: Resources for Guided Listening
http://lrs.ed.uiuc.edu/students/yyang/HTML/prj.html