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Note Set Sequence

An ordered sequence of note sets (chords) that may contain duplicates

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Resolve a progression in a key

Roman numerals describe functions relative to a selected key. Change the key to reinterpret the same numerals, or transpose the resulting MIDI notes by a fixed number of semitones. These are different operations.

Transpose0 st
CC♯DD♯EFF♯GG♯AA♯B4

Selected chord: Cmaj7 · octave-free set

Key

C major

Scale notes

C-D-E-F-G-A-B

Pitch classes

0-4-7-11

Resolved chord symbols (before shift)

Cmaj7 - G7 - Am7 - Fmaj7

C is the tonic; major supplies the scale. Roman numerals resolve to diatonic seventh chords where available. The semitone control moves the resolved notes after that interpretation.

Written forms

Ways to write this concept

Each notation describes the same underlying object. Load a playable example to hear one MIDI realization in the Code Sequencer.

midi

Sequence of MIDI note sets

  • 60-64-67,65-69-72,60-64-67

letter

Sequence of letter notation sets

  • C4-E4-G4,F4-A4-C5,C4-E4-G4

name

Sequence of traditional chord names, when applicable. Will use a default octave, but will render 13th extension better than using PC sets analysys.

  • C-F-G-C
  • Dm7-G7-Cmaj7

timed

The same progression with durations committed — comma-separated chord:duration pairs (a chord is dash-joined MIDI numbers, duration in beats, quarter = 1). A chord chart and a timed clip are two notations of one progression.

  • 0-4-7:2,5-9-0:2,7-11-2:4
  • 0-4-7:1,0-5-9:1,2-7-11:2
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.

Concept connections

Pc Set SequenceAn ordered sequence of pitch class sets that may contain duplicatesPoint Set SequenceAn ordered sequence of point-sets that may contain duplicatesPc song formA song form whose section progressions are octave-free (pitch-class) — the octaveless abstraction of a song-form. Keeps section labels, order, and harmony but drops register. Its `groupOf` is pc-set-sequence.Point song formA song form reduced to non-pitch-specific shapes — section labels and order are kept, but each chord is a point-set (offsets, no key). This is the transposition-invariant structural fingerprint of a song: two songs in different keys with the same form land on the same point-song-form, so it is the natural representation for song-to-song similarity. Its `groupOf` is point-set-sequence.Note sequenceAn ordered line of notes and optional rests. Adding durations makes its rhythmic placement explicit.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).
Sources and playback

Concept descriptions and examples were adapted from Codex Music Mono’s typed catalog and concept examples. The Code Sequencer plays MIDI through a connected instrument; Symbolic does not synthesize sound.