Many people do not understand the importance of sound in their daily and casual lives. It is defined as physical phenomenon that stimulates the sense of hearing. Sound is produced by any vibrating objects because vibration is needed to produce anything that is heard to the ear of a human.
Musical instruments produce sound in various ways.
Compressions and rarefactions cause sound to be produced which also have different frequencies and different characteristics of tonal quality. Depending on what kind of sound is produced, these variables change with each type. Many different kinds of variables are found in musical instruments. Certain types of sound are produced depending on what kind of instruments are used. Various types are created by different frequencies and tonal quality.