Musical Glossay

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perfect fifth

Pitch difference between two simple notes next to the octave. In the case of a stringed instrument as shown in the figure below, the pitch increases by one octave when the length of the string becomes half (B) of (A). In addition, when the length (C) is 1/3, the difference in pitch is one octave higher than the pitch of (A) in length by 5 degrees. The pitch difference of this half length and 1/3 length is completely 5 degrees. Even if the octave changes, the sound relation does not change. Basically, the relation between the pipe length and the pitch of wind instruments is the same. This pitch melts well and you almost can not hear it as a single sound. In the mean temperament it is impossible to take this pitch (the score on the bottom is approximate). The inverted form is completely 4 degrees. There are also 5 degrees increase and 5 degrees decrease to 5 degrees other than complete 5 degrees.

In the case of string instruments the pitch increases by one octave as the length of the string is halved. Conversely, if it is doubled, it will go down one octave.

In the case of wind instruments the pitch increases by one octave when the length of the pipe is halved. Conversely, if it is doubled, it will go down one octave.

There are 8 degrees and 8 degrees less than 8 degrees at 8 degrees.

By the way, the pitch difference of 2 octaves is not perfect 16 degrees, but it is 15 degrees perfect (let's count the number of sounds).

音楽の本
	独・仏・伊・英による音楽用語辞典 【改訂版】
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