Chord Player

An MCP server that plays chord progressions via MIDI/WAV synthesis.

Prerequisites

• FluidSynth with a SoundFont installed
• uv (for uvx)

# macOS
brew install fluid-synth

Setup (Claude Code)

Add the following to the mcpServers section in your ~/.claude.json:

{
  "mcpServers": {
    "chord-player": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/mohhh-ok/[email protected]", "chord-player-mcp"]
    }
  }
}

MCP Tools

play_chords

Play a chord progression.

Parameter	Description	Default
chords	Space-separated chord progression (e.g. "C Am F G")	required
bpm	Tempo	120
beats	Beats per chord	4
instrument	Instrument name or GM program number	piano
voicing	close / open / drop2	close
velocity	Volume (0-127)	90
output	Output WAV path (temp file if omitted)	-

list_instruments

Returns a list of available instrument names.

Supported Chords

Major (C), minor (Cm), 7th (C7), maj7 (Cmaj7), m7 (Cm7), dim, dim7, aug, sus2, sus4, 7sus4, add9, madd9, 6, m6, 9, maj9, m9, 5 (power chord). Slash chords (C/E) are also supported.

Instruments

piano, electric_piano, guitar, acoustic_guitar, organ, strings, bass, violin, flute, sax, trumpet, synth_pad, vibraphone, choir, and more.

Examples

# Basic progression
play_chords("C Am F G")

# Jazz voicing
play_chords("Cmaj7 Am7 Dm7 G7", bpm=90, instrument="electric_piano", voicing="drop2")

# Guitar ballad
play_chords("G Em C D", bpm=72, instrument="guitar", beats=8, voicing="open")

# Slash chords
play_chords("C C/B Am Am/G F G C", bpm=100)