analysis / Symbolic

Key sequence

A time-ordered map of keys and modulations. It keeps track of where a piece changes tonal center instead of assigning one key to the whole piece.

Try it

Map key changes across a piece

Choose a key at each beat boundary to create a modulation map. Editing one segment changes that local key; transposing the whole sequence moves every tonic while preserving modes and boundary times.

Starts at beatKey

Transpose0 st

Modulation timeline · beats 0–24

Original key map

0:C major,8:G major,16:A minor

Transposed key map

0:C major,8:G major,16:A minor

Selected key

C major

Selected scale PCs

0-2-4-5-7-9-11

The clock shows the selected key’s scale pitch classes. Changing key within the map is a modulation; the semitone control moves every segment together.

Written forms

Ways to write this concept

Each notation describes the same underlying object. Open an example to see it in every other notation, or load it to hear one MIDI realization in the Code Sequencer.

keys

Ordered modulation map: comma-separated 'startBeat:key' entries

0:C major, 8:A minor, 16:C major

Choose Load beside a convertible example to open its live player. Some catalog formats describe analysis or a display label and have no note realization yet.

KeyA tonic pitch class and mode that give scale degrees and Roman chord functions their context.ScoreA polyphonic texture — several voices (temporalized lines / tracks) sounding at once over a shared timeline. The simultaneous counterpart of a note-set: where a note-set stacks single notes into a chord, a score stacks whole lines. Its `groupOf` is note-sequence. Collapse the voices at each instant and you get a chord progression (note-set-sequence) — the resulting chord qualities of the simultaneous notes; conversely, a chord progression can be voice-led into a score. Strip pitch and it becomes a point-score (key-independent counterpoint).

Map key changes across a piece

Modulation timeline · beats 0–24

Ways to write this concept

keys

Concept connections