In music theory, the Circle of Fifths (also called Circle of Fourths) is a way of organizing the 12 chromatic pitches as a sequence of perfect fifths. This Circle of Fifths trainer allows you to figure out chord progressions (e.g. I, IV, V) in any key for more than 80 heptatonic scales. It is useful for composing chord progressions/modulations and mixing in keys. This advanced circle of fifths app is very useful for beginners and experienced musicians. Features: ⭐ Circle of Fifths and Fourths