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Theory orbit
See harmony move before naming the rule.
A playable circle-of-fifths, keyboard map, and chord progression lab for hearing tonic, dominant, subdominant, and relative-minor relationships.
Renders theory, arrangement, and recital probes in the browser before saving proof.
KeyCneighbors F / G
Scale mapC major / A minor
C1C#xD2D#xE3F4F#xG5G#xA6A#xB7
pulls home
relative color
opens space
Shows nearby keys, tonic/dominant/subdominant motion, and relative minor families as a visual map.
Maps abstract numbers to a visible instrument surface before asking for notation labels.
Every clicked orbit point updates the keyboard, chord cards, and Web Audio progression so the rule becomes audible.
Keys are nodes, fifths are edges, and chord functions are reusable paths through a musical graph.
Visual method playgroundCommon methods plus Koydo-built theory surfaces.
Select a method, adjust density and motion, then save the visual reasoning as portfolio evidence.
commonRhythm Fraction Grid
Fill a measure with beat blocks, then explain the fraction each sound owns.
- Grid cells turn quarter, eighth, and rest values into visible area.
- Fractions, ratios, arrays
Methodology atlasEstablished teaching methods plus Koydo-built surfaces.
Compare the methods music teachers already use with underbuilt browser-native methods that make theory visible, playable, and saveable.
1move2hear3name
establishedBody-to-theory movement
Learners walk, stop, stretch, and change direction before naming rhythm, phrase, or tension.
Motion controls change density and chord pull so the body idea becomes a playable visual field.
Harmony output meter0% safe synth output