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Why are C major and G major closely related keys?
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scale
The universality and innate nature of music, and the pentatonic scale, as demonstrated by singer Bobby McFerrin.
C major and G major are considered closely related keys because they share a high degree of similarity in their diatonic scales. Specifically, these two keys have six of their seven notes in common, differing only by a single note—C major uses an F natural, while G major uses an F sharp.1
This relationship is also fundamental to the circle of fifths, a visual tool used to organize musical keys based on their structural connections. In this system, G major is a perfect fifth above C major, establishing a strong tonic–dominant relationship. Because they are adjacent on the circle, transitioning between these keys maintains musical continuity, making them ideal for smooth modulations within a composition.213