The key to sound transmission is : vibrations from strumming a guitar cause air particles to vibrate too, initiating that carry the vibration through the air. A sound's is the number of waves that pass a certain point at a given time. A pitched noise is the result of shorter waves moving in and out more quickly, while fewer, slower fluctuations result in a pitch. How loud a sound registers depends on the wave's , or the difference between the high and low created in the air by that sound wave