Question 1

What is the Circle of Fifths?

Accepted Answer

The Circle of Fifths is a visual diagram showing the relationships between all 12 musical keys. Each key is a perfect fifth (7 semitones) from its neighbor. Moving clockwise adds sharps, counter-clockwise adds flats. It reveals key signatures, chord relationships, and modulation paths — the foundational map of Western music theory.

Question 2

How do I use the Circle of Fifths for chord progressions?

Accepted Answer

Adjacent keys on the circle share 6 of 7 notes, making transitions between them smooth. Common progressions follow the circle: I-IV-V-I moves counter-clockwise then clockwise. The ii-V-I jazz cadence follows clockwise motion. Our Progression Analyzer mode lets you type any chord progression and see it analyzed with Roman numerals on the circle.

Question 3

What are chord-scale relationships?

Accepted Answer

Chord-scale theory pairs each chord with scales that sound good over it. For example, Dm7 pairs with D Dorian, G7 with G Mixolydian or G Altered, and Cmaj7 with C Ionian or C Lydian. Our Chord-Scale Explorer mode shows chord tones (safe notes), tensions (color notes), and avoid notes (clashing notes) for every combination.

Question 4

What are the 7 modes in music?

Accepted Answer

The 7 modes of the major scale are: Ionian (major), Dorian (minor with bright 6th), Phrygian (dark, Spanish), Lydian (dreamy, raised 4th), Mixolydian (bluesy major), Aeolian (natural minor), and Locrian (unstable, diminished). Each mode creates a unique emotional character using the same notes but starting on a different degree.

Question 5

How many lessons and quizzes does this app have?

Accepted Answer

The app includes 24 comprehensive lessons with 376 quiz questions spanning beginner to university level. Topics cover Circle of Fifths fundamentals, key signatures, scales, chord progressions, modes, intervals, ear training, voice leading, chord-scale relationships, reharmonization, altered dominants, scale geometry, classical counterpoint theory, and world music scales.

Question 6

Is this app free?

Accepted Answer

Yes, the Circle of Fifths Interactive Explorer is completely free. All 13 interactive modes, 24 lessons, 376 quiz questions, and audio playback features are available at no cost. No registration or subscription required.