Chord Accompaniment

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What this node does

Chord Accompaniment turns a chord-symbol progression (like Am7 | Dm7 | G7 | Cmaj7) into an actual accompaniment: it realizes each chord into real notes, applies a voicing, and lays it out with a rhythmic pattern (block chords, arpeggios, and so on). It’s the fast way to get a comping/backing part without writing out every note. Press ▶ Run to generate on the backend. The node emits two outputs: a performance payload (feed it to Score Synth to hear it) and a midi_url pointing at an exported Standard MIDI File. Type the progression in the node’s progression field, or wire a progression_text input to drive it from upstream. Chords are separated by spaces; | marks bar lines.

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When to use it

• You want an instant backing part under a melody or for practice.
• You have a chord chart and need it realized into playable notes/MIDI.
• You want to audition different voicings and rhythmic feels for a progression.

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Parameters

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progression

The chord progression text, default Am7 | Dm7 | G7 | Cmaj7. Chords are space-separated; | marks bars. Used when no progression_text input is wired.

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bpm

Tempo in beats per minute, 20–300 (default 100), in 0.5 steps.

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beats_per_bar

Beats per bar, 1–12 (default 4).

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pattern

The rhythmic accompaniment pattern, default block (all chord tones struck together). The other options come from the accompaniment pattern set (e.g. arpeggiated styles).

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voicing

How the chord tones are spaced, default close (tones packed tightly). Other options come from the voicing set (e.g. wider, spread voicings).

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octave_shift

Shift the whole part up or down by octaves, -2 to +2 (default 0).

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velocity

Note velocity (loudness/attack), 20–127 (default 88).

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repeats

How many times to repeat the whole progression, 1–16 (default 1).

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progression_text (optional input)

An optional text input, type COMFYTV_TEXT, carrying the progression. When wired, it takes priority over the progression field. Running with no progression at all fails with a “needs a progression” message.

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Outputs

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Tips

• Use | to define bars; without them the whole line is read as chords in sequence.
• Try close vs. a wider voicing and switch pattern between block and arpeggiated to change the feel without retyping the chords.
• Set repeats to loop a short progression into a longer bed.

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Related nodes

• Score Synth — renders the performance to audio.
• Score Performer — the melodic counterpart (performs a written score).
• Click Track — pair with a metronome for a full backing bed.
• Bridge — convert to/from native ComfyUI types. See https://github.com/jtydhr88/ComfyTV/blob/main/docs/bridges.md