A vibration of your eardrum is responsible for the thing we call sound. For a human, the ear can only detect sounds that vibrate between 20 and 20,000 times per second. Vibration rates within these limits are audible. Slower vibrating (infrasonic) or faster vibrating (ultrasonic) can not be heard. Animals have various other ranges.

Aeolian Harp
Air Reed
Big Drum
Circular Scales
Conversation Piece
Frequency Excluder
Gong Forever
Harmonic Series Wheel
Hearing Range
Lissajous Patterns
Listening Vessels
Multiplied Glockenspiel
Music Box
Music Room - Guitars
No Sound Through Empty Space
Organ Pipe
Piano Strings
Pipes of Pan
Sound Cart Demonstration
Sound Column
Sound Sculpture
Speech Dissector
Stereo Sound I
Stereo Sound II
Tone Memory
Two Ways to Look at Sound
Violin Air Resonance
Violin Tone Color
Visible Effects of the Invisible
Vocal Mirror
Vocal Vowels
Voice Trace
Voice Trombone
Walking Beats
Wave Organ

We'll be adding interesting info and links here. If you have a good one, we need your feedback