melrose-mcp

## melrose-mcp [melrōse](https://melrōse.org) is a tool to create and play music by programming melodies. It uses a custom language to compose notes and create loops and tracks to play. `melrose-mcp` is an [MCP](http://modelcontextprotocol.io/) server (STDIO) that uses the packages from the `melrōse` tool. ## installation This mcp server requires the [Go SDK](https://go.dev) for installation. To produce music, you need to setup a MIDI receiver such as a DAW or a hardware synthesizer. go install github.com/emicklei/melrose-mcp@latest ## tools - melrose_play - melrose_bpm - melrose_devices - melrose_change_output_device ## session > change the tempo in melrose to a lower value `melrose_bmp` request: ```javascript { `bpm`: `80` } ``` `llm` response: ``` I've reduced the tempo to 80 beats per minute from the default of 120 BPM. This creates a more relaxed and slower pace for any musical expressions we play. ``` > play a tune from Claude Debussy `llm` response: ``` I'll create a small segment inspired by Claude Debussy's impressionist style using the Melrose language at our current tempo of 80 BPM. ``` `melrose_play` request: ```javascript { `expression`: `sequence('(F4 A4 D5) 4(F4 A4 D5) (G4 B4 E5) 4(G4 B4 E5) (A4 C5 F5) 4(A4 C5 F5) (G4 B4 E5) 4(G4 B4 E5) (F4 A4 D5) 8= 8(E4 G4 C5) 4(F4 A4 D5)')` } ``` `melrose_play` response: ```javascript 12.749963417s ``` ## configuration in your client Below an example to configure it in Claude Desktop. { "mcpServers": { "melrōse": { "command": "<YOUR DIRECTORY TO THE BINARY>/melrose-mcp", "args": [] } } } ## example prompts - play the music sequence C D E - play the first bar of fur elise - play the famous tune from Mike Oldfield called Tubular Bells - play the notes of Frere Jacques - play the C# chord To help your LLM understand the Melrōse language better, you can use this [context](resources/melrose_llm_context.txt). ### Contributions Fixes, suggestions, documentation improvements are all welcome. Fork this project and submit small Pull requests. Discuss larger ones in the Issues list. You can also sponsor Melrōse via [Github Sponsors](https://github.com/sponsors/emicklei). Software is licensed under [MIT](LICENSE). &copy; 2025 [ernestmicklei.com](http://ernestmicklei.com)