Playground experiment

Circle of Fifths Network

A small interactive music-theory graph. Click a key to highlight its closest harmonic neighbors, relative minor, and a simple I–vi–IV–V progression.

← Back to Playground

Interactive harmony graph

Keys as connected nodes

Outer nodes are major keys. Inner nodes are their relative minors. Neighboring major keys are a fifth apart, which makes them natural modulation targets.

Selected: C major

Current key

C major

Dominant G major

Subdominant F major

Relative minor Am

Progression C → Am → F → G

The sound is intentionally simple: plain synthesized triads, just enough to hear the relationship.

What to notice

Moving clockwise adds sharps and moves by fifths. Moving counterclockwise adds flats and moves by fourths. Nearby keys share many notes, which is why they are common modulation targets.

Why in the Playground

It uses the same graph idea as the data-science toys, but applied to harmony. Chords, keys, and progressions can all be treated as nodes and transitions. + I simply like music theory