Musical Glossay

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perfect fourth

Five degree inverted form. In the case of stringed instruments, the pitch increases by one octave when the length of the string becomes half (B) of (A) as shown in the figure below. 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. And when it is 1/4 (D), it is half of half, so it will be 2 octaves. The pitch difference of 1/3 length and 1/4 length is completely 4 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 5 degrees. There are also 4 degrees increase and 4 degree decrease other than complete 4 degrees for 4 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】
	これで納得!よくわかる音楽用語のはなし―イタリアの日常会話から学ぶ – 関 孝弘 (著)
	持ち歩き　音楽記号事典 – 多田 鏡子 (著), 川島 素晴 (監修)
	音楽の科学---音楽の何に魅せられるのか？ – フィリップ ボール (著), 夏目 大 (翻訳)