纯五度

纯五度在音数为3又2分之1(3½)的五度音程謂之，在台灣稱作完全五度，如C-G，D-A，E-B，bB-F，B-#F，#F-#C，bC-bG等就是纯五度。纯五度的二個音，其頻率比會有3:2的關係。

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