Mathematics of Music Demo Pages
Oscillator sandbox - Play around with oscillators.
Composition - Compose music in terms of frequencies.
Composition in mod 12 - Compose music in terms of pitch classes.
Superposition Graph - Graph of the superposition of two sine waves.
Harmonics Explorer [external] - Explore the sound of changing various harmonics.
Harmonic Motion - Simple SAGE animation of a harmonic motion
Masses & Springs Lab [external] - Flash Lab for playing around with masses and springs (flash animation)