The same pattern continues as we increase the octaves. Playing that same string with the twelfthįret pressed produces a High E - a note one octave higher, with frequency twice as high. For example, the first string of a guitar is normally tuned to Middle E. This leads to a frequency which is twice as high, and thus corresponds to a note one octave higher. This makes it vibrate precisely twice as quickly.
There, pressing a guitar string at the twelfth fret cuts the string precisely in half. We can draw a graph by puttingĪn X at every time when a pocket of air arrives: Equivalently, the pockets of air arrive so quickly that one pocket strikes your ear every 0.00382 seconds. That means that when Middle C is played, 262 pockets of higher air pressure pound against your ear each second. This note has a frequency of about 262 Hertz. With music, the frequency at which these pockets strike your ear controls the pitch that you hear.įor example, consider the note called "Middle C" (usually the first note learned in piano lessons). (Or, as the horror movies would say: in space no one can hear you scream.)Ī sound wave creates minute pockets of higher and lower air pressure, and all the sounds we hear are caused by these pressure changes. In fact, sound progresses as a wave through the air, and sound cannot be produced without an atmosphere. Music appears to be transmitted by magic, escaping from your expensive stereo - or a loudly passing car radio, or a guitar-strumming maestro - and accosting your eardrums in one fell swoop.
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