BluesPrince/thiri-mcp

Overview

A deterministic music-theory MCP server and API that provides chord analysis, Roman-numeral analysis, voicing, and reharmonization for use with Claude and Cursor. It computes results from music theory rules rather than relying on generative AI, ensuring consistent and hallucination-free outputs. Hosted at mcp.thiri.ai and installable via npx.

Best for

Best for
Developers and musicians who need reliable, rule-based music theory analysis inside AI coding environments

Use cases

• Analyze chord progressions with Roman-numeral notation in a code editor
• Generate voicings and reharmonizations for composition or arrangement
• Integrate deterministic music theory into AI-assisted music production workflows

How to use

Install

claude mcp add thiri --env THIRI_API_KEY=sk_live_your_key -- npx -y @bluesprincemedia/thiri-mcp

Tools exposed

• analyze_chord
• resolve_chord
• generate_voicing
• conduct_band
• thiri-conductor-mcp
• thiri-composition-mcp
• THIRI_API_KEY
• THIRI_API_URL

Tested with

Claude Desktop, Claude Code, Cursor

Example client config

{\n  "mcpServers": {\n    "thiri": {\n      "command": "npx",\n      "args": ["-y", "@bluesprincemedia/thiri-mcp"],\n      "env": { "THIRI_API_KEY": "sk_live_your_key" }\n    },\n    "thiri-conductor": {\n      "command": "npx",\n      "args": ["-y", "@bluesprincemedia/thiri-mcp", "thiri-conductor-mcp"],\n      "env": { "THIRI_API_KEY": "sk_live_your_key" }\n    },\n    "thiri-composition": {\n      "command": "npx",\n      "args": ["-y", "@bluesprincemedia/thiri-mcp", "thiri-composition-mcp"]\n    }\n  }\n}

Notes

A deterministic music-theory MCP server and API that provides chord analysis, Roman-numeral analysis, voicing, and reharmonization for use with Claude and Cursor. It computes results from music theory rules rather than relying on generative AI, ensuring consistent and hallucination-free outputs. Hosted at mcp.thiri.ai and installable via npx.

1 stars on GitHub. Last updated 2026-06-20. Licensed MIT.

Use cases

• Analyze chord progressions with Roman-numeral notation in a code editor
• Generate voicings and reharmonizations for composition or arrangement
• Integrate deterministic music theory into AI-assisted music production workflows

Pros

• Deterministic results eliminate hallucination risks common in generative models
• Works directly with popular AI coding tools like Claude and Cursor
• Simple installation via npx for quick setup

Cons

• Limited to music theory operations, not a general-purpose tool
• Small community with only 1 star on GitHub, indicating early-stage adoption
• Requires an external MCP host (Claude/Cursor) to function

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.