10.10 Musical Sounds


Periodic variations in the loudness of two mismatched frequencies are called beats. Duration: 2:58.

Noise and Music

Noise and music are two flavors of sound, but how exactly are they different and how are they similar? Duration: 4:17.


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 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).

Sound Quality

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

Musical Instruments

Three traditional categories of musical instruments: String, Wind, and Percussion. (Duration: 3:05)

Fourier Analysis

Waves add together to create a composite wave. Is it possible to start with a composite wave and figure out the component waves? (Duration: 4:13)