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Activity
Texas Instruments

Texas Instruments: Fourier Analysis

For Teachers 9th - 10th
Students use the TI InterActive! software to explore the connection between a function and its Fourier series.
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Handout
Wikimedia

Wikipedia: Simple Harmonic Motion

For Students 9th - 10th
Wikipedia offers great information on simple harmonic motion, including an image, formulas, and hyperlinked terms.
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Primary
Other

Physics and Psychophysics of Music

For Students 9th - 10th
This site is filled with information pertaining to the physics of sound and music.