Definition of Circle of thirds
In music theory, the circle of thirds, also known as the cycle of thirds, is a way of organizing pitches, and a musical tool that helps musicians remember and memorize the order of thirds in a scale, and hence the notes of the chords in those scales. The circle of thirds is not as well known or as versatile as the circle of fifths, but it can still be a valuable concept for musicians. For example, the cycle of thirds is inherently relevant to chord construction, as most triads are built from thirds.
Because the circle of thirds is based on the order of thirds in a scale, rather than its ascending scale degrees, the scale degrees of the cycle are in the following order: 1-3-5-7-2-4-6. In the key of C, the order of notes will be C-E-G-B-D-F-A. However, when in a key other than C, the order won't start from C but will still be the same overall order when seen as a circle. For example, for A minor, it is A-C-E-G-B-D-F.
The circle of thirds can be played by alternating intervals of a major and minor third in one direction.
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Frequently asked questions
What is Circle of thirds?
In music theory, the circle of thirds, also known as the cycle of thirds, is a way of organizing pitches, and a musical tool that helps musicians remember and memorize the order of thirds in a scale, and hence the notes of the chords in those scales.