A Music Primer: For Schools

An excerpt from the INTRODUCTION. 1. Sound is the effect on the ear of a wavelike (undulatory) motion of an elastic medium, caused by the vibrations of an elastic body.

2. When the vibrations occur at regular intervals, and the waves are therefore of equal length, a musical sound is produced.

3. Musical sounds differ from each other (independently of their duration) in intensity, character and pitch, - determined respectively by the extent, form, and frequency of the vibrations.