Chord of a Circle Pro

The chord circle is a fundamental tool in music theory used to visualize and understand keys and tonal relationships. It consists of twelve notes evenly arranged on the circle, which represent the twelve different tones of the chromatic scale. The notes in the chord circle are arranged in ascending fifths, meaning that each note is five semitones higher than the previous one.

The chord circle is helpful for determining which keys harmonize with each other. For example, the key that is a fifth above or a fourth below the current key in the chord circle is often harmonically compatible. This is the basis for the structure of chord progressions and modulations in music.

The chord circle can also help with transposing pieces of music because it shows how notes in different keys are connected to each other. It is an essential tool for musicians and composers to understand and creatively deal with the structure and relationships between keys.

Recent changes:
New version! Built with Kotlin & SDK 36 for top performance. Build any chord in seconds — pick a tone on the orange circle, read the numbers on the green circle. 1-3-5 = major, 1-b3-5 = minor, 1-3-5-7 = major seventh. Works the same for every key! No theory knowledge needed. Spin the interactive Circle of Fifths with your finger. Chord formula chart, interval maps, Greensleeves chords. Pinch to zoom on everything. Your pocket music theory teacher. Phone & tablet.