Circle of Fifths, Opus 2 is a music theory tool for musicians exploring jazz and a variety of music styles that incorporate musical modes. For a beginner version of Circle of Fifths, check out our Circle of Fifths, Opus 1 edition, where you can explore major keys and relative minor keys. FEATURES • Interactive circle: rotate the circle or tap on any key. • Switch between the scale or circle chord progression. • Play scale or chord progression out loud. • Tap on individual chords to explore chord patterns. • Includes both chord name and roman numeral notation. • Choose from treble, bass, or alto clef. Circle of Fifths was created by Lucius Kwok and Agnes Chan. Made in NYC.