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Circle of fifths
Circle of fifths showing major and minor keys Nikolay Diletsky 's circle of fifths in Idea grammatiki musikiyskoy (Moscow, 1679) In music theory , the circle of fifths (or circle of fourths ) is a visual representation of the relationships among the 12 tones of the chromatic scale , their corresponding key signatures , and the associated major and minor keys. More specifically, it is a geometrical representation of relationships among the 12 pitch classes of the chromatic scale in pitch class space . [ edit ] DefinitionThe Interactive Circle of Fifths ("the Circle" for short) is a tool designed to help musicians to: figure out the key of a piece of music easily transpose music to a different key compose new music understand key signatures, scales, and modes The concept of the circle of fifths is not a new one (see this Wikipedia article for more information), but there is more to this simple, yet profound structure than the traditional diagram can easily convey. The Interactive Circle of Fifths goes beyond the limitations of a static diagram without sacrificing clarity and simplicity.
Interactive Circle of Fifths User's Guide