Music theory is the study of how and why music works the way it does, and how musical structures have changed throughout history.
All musicians, regardless of their specific discipline, must understand how music is organized and how it works. I think of this like the difference between knowing how to drive a car and knowing how to fix a car. The driver is only functional as long as everything is working properly; the mechanic can both fix and drive the car. The everyday human being does not need to look "under the hood" to appreciate the music they encounter, but musicians are specialists and need that deeper understanding (whether intellectual or intuitive; preferably both) to be truly effective in their work and bring their music to life.
This portion of the site features materials I have used in my music theory teaching - handouts, listening examples, and expanations of concepts. I've made them available to the public to help those looking to deepen their understanding of music. You may use anything you find here, but please credit me as the author, and do not modify anthing without my consent. Also, please feel free to contact me with any questions - I am happy to help. Thank you, and enjoy!