8.A Sensing Pitch

Sound Intensity and Loudness

Sound intensity is the rate at which sound energy arrives over a given surface area. Loudness is the biological interpretation we make of sound intensity reaching our ear. (Duration 7:11).

Forced Vibrations

Sound can be amplified by placing the vibrating object, such as a tuning fork or a string, in contact with a surface also able to vibrate at that frequency. Duration: 2:58.


This video is a review of the basics of how music works, including the ideas of pitch, notes, sharps, flats, overtones, scales, and keys. Duration: 6:28.

Sound Quality

Why do different musical instruments, including the human voice, sound different, even when playing the same note? (Duration: 8:53)