The Ultimate Guide to the Circle of Fifths
The Circle of Fifths is the roadmap of music theory. It is a visual representation of the relationship between the 12 tones of the chromatic scale, their corresponding key signatures, and the associated major and minor keys. Whether you are a songwriter, producer, or student, mastering this tool will unlock the ability to compose music with confidence.
Why use this Interactive Tool?
While a static image is useful, this interactive tool brings theory to life. By selecting a key on the circle, you instantly see the Diatonic Chords (the chords that naturally belong in that key) and the Key Signature (how many sharps or flats). Furthermore, our integrated Audio Engine allows you to hear these relationships immediately.
Understanding the Features
- Key Selection: Click any sector on the wheel. The outer ring represents Major keys, while the inner ring represents Relative Minor keys.
- Roman Numeral Analysis: Chords are labeled with Roman Numerals (e.g., I, IV, V). This system allows you to transpose progressions to any key instantly.
- Chord Sequencer: Don't just look at chords—play them. Click on any chord card to add it to the timeline below. Press "Play" to loop your idea and adjust the BPM to find the right groove.
Advanced Feature: Secondary Dominants
To make your chord progressions sound more professional or "jazzy," we have included a section for Secondary Dominants. These are chords borrowed from other keys to create a stronger pull towards the next chord.
- The Major II (V/V): In the key of C, the ii chord is Dm. By changing it to D Major, it becomes the dominant of G (the V chord). This creates a "lift" before resolving.
- The Major III (V/vi): In the key of C, the iii chord is Em. By changing it to E Major, it becomes the dominant of Am (the vi chord). This is extremely common in Pop and R&B music to create emotional tension.