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in this video series I plan to cover in[br]moderate depth

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some of the driving concepts in today's[br]tuning theory

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before I can do that however you need[br]to know a little about standard tuning

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and some basic acoustics

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sound is waves of pressure that[br]travel through the air

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the rate at which the high and the low[br]pressures alternate

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is referred to as the sound's frequency

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note that the word frequency though[br]often used synonymously

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with the word pitch actually refers[br]directly to how frequent

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the pressure oscillations are

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frequency is measured in the unit called herz[br]which denotes the number

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of oscillations per second

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when those high and low pressure waves[br]make contact with our ear drum

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it flexes in accordance with those waves[br]and sends that information to the brain

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this is where frequency

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immeasurable phenomenon becomes pitch. a[br]subjective experience

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the pitch of a note refers to how[br]high or low it sounds

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and changes in[br]pitch

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a.k.a. intervals [br]are measured in the units called cents

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where there are twelve hundred cents per[br]octave

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pitch and frequency are related[br]logarithmically

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meaning that linear changes in pitch[br]like going up in octave

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are actually multiplications of frequency

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octave specifically are a doubling [br]of frequency for instance

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from 400 to 800 herz is heard as an[br]octave

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and so is from 800 herz to 1600 herz

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because each is a multiplication by[br]two

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western music uses a collection of pitches

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that divides the octave [br]into 12 equal parts

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100 cents each[br]makes all intervals multiples of 100 cents

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this is only one option however

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out of an infinite number of possible ways[br]to choose what intervals to include in

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your music

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that is to say it is only one possible[br]tuning

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among an infinite number of tunings[br]this twelve-tone

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equal tuning is so ubiquitous in the[br]West however

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that most musicians are unaware that it[br]has a name

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and the alternatives even exist

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up next we dive into a fundamental[br]concept in the world of tuning

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just intonation