> ## Documentation Index > Fetch the complete documentation index at: https://comfytv.org/llms.txt > Use this file to discover all available pages before exploring further. # Chord Accompaniment > Type a chord progression and get a played-out backing part — voiced, patterned and exported as MIDI. Chord Accompaniment ## 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. ## 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. ## Parameters ### progression The chord progression text, default `Am7 | Dm7 | G7 | Cmaj7`. Chords are space-separated; `|` marks bars. Used when no `progression_text` input is wired. ### bpm Tempo in beats per minute, **20–300** (default **100**), in 0.5 steps. ### beats\_per\_bar Beats per bar, **1–12** (default **4**). ### 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). ### voicing How the chord tones are spaced, default **close** (tones packed tightly). Other options come from the voicing set (e.g. wider, spread voicings). ### octave\_shift Shift the whole part up or down by octaves, **-2 to +2** (default **0**). ### velocity Note velocity (loudness/attack), **20–127** (default **88**). ### repeats How many times to repeat the whole progression, **1–16** (default **1**). ### 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. ## Outputs | Output | Type | Meaning | | --------------- | -------------- | ------------------------------------------------- | | **performance** | `COMFYTV_TEXT` | The realized accompaniment (JSON) for Score Synth | | **midi\_url** | `COMFYTV_TEXT` | URL to the exported Standard MIDI File (`.mid`) | ## 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. ## 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](https://github.com/jtydhr88/ComfyTV/blob/main/docs/bridges.md)