Recently, I gave an 'Introduction to Music Theory' talk, on behalf of one of my choirs.

I've tried to take a physics-up approach -- without getting too maths-heavy.

On this page are links to several things: a PDF of slides, three PDFs of sine waves in various configurations, and a collection of various small MuseScore files used to demonstrate examples.

If you have further questions, feel free to email me at musictheory@abjago.net