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Works with

Claude CodeClaude DesktopCursorVS CodeClineCodex CLIOpenClaw+ any MCP client

Install to Claude Code

This server doesn't publish a one-line install command. Follow the setup in the source repository.

Summary

Enables musical analysis of MIDI and musicXML files using music21, providing tools for key detection, harmony, melody, rhythm, form analysis, counterpoint checking, and motif extraction.

README.md

music21 MCP Server

Servidor MCP de análise musical usando music21 + FastMCP + Pydantic.

Complementa o seu MIDI-compostion-tools-MCP focado em construção: enquanto o toolkit constrói composições, este servidor analisa arquivos existentes.

---

🛠 Tools disponíveis (8)

| Tool | O que faz | |---|---| | score_info | Visão geral: título, compositor, partes, assinaturas, duração | | analyze_key | Detecta tonalidade (algoritmo Krumhansl-Schmuckler) com confiança | | analyze_harmony | Extrai acordes, numerais romanos, cadências, progressão resumida | | analyze_melody | Contorno, âmbito, intervalos, clímax, lista de notas | | analyze_rhythm | Fórmula de compasso, tempo, densidade, síncope, padrões rítmicos | | analyze_form | Detecta seções (A, B, A'…), repetições, forma geral (ABA, Rondó…) | | check_counterpoint | Erros de voice-leading: quintas paralelas, cruzamentos, saltos | | analyze_motifs | Motivos recorrentes e suas transformações (inversão, retrogrado…) |

---

📦 Instalação

# 1. Clonar / copiar a pasta music21-mcp
cd music21-mcp

# 2. Criar ambiente virtual (recomendado)
python -m venv .venv
source .venv/bin/activate      # Linux/macOS
.venv\Scripts\activate         # Windows

# 3. Instalar dependências
pip install -r requirements.txt

---

▶️ Executar

python server.py

O servidor roda via stdio — padrão para integração local com Claude Desktop, Cursor, etc.

---

⚙️ Configuração no Claude Desktop

Adicione ao seu claude_desktop_config.json:

{
  "mcpServers": {
    "music21": {
      "command": "python",
      "args": ["/caminho/absoluto/para/music21-mcp/server.py"],
      "env": {}
    }
  }
}

Dica: se usar virtualenv, use o Python do venv: "/caminho/para/music21-mcp/.venv/bin/python"

---

🔗 Integração com seu MCP Music Toolkit

Pipeline típico:

music21 MCP (analyze_harmony)
    → detecta progressão do arquivo
    → passa para seu toolkit (comp_set_progression)
    → gera variação ou arranjo

music21 MCP (check_counterpoint)
    → aponta erros no MIDI gerado
    → seu toolkit (theory_voice_lead_sequence)
    → corrige o voice leading

---

📁 Estrutura

music21-mcp/
├── server.py              # FastMCP — 8 tools registradas
├── models.py              # Pydantic schemas input/output
├── requirements.txt
├── analyzers/
│   ├── harmony.py         # Acordes + numerais romanos + cadências
│   ├── melody.py          # Contorno, âmbito, intervalos
│   ├── rhythm.py          # Tempo, densidade, síncope
│   ├── form.py            # Seções e forma musical
│   ├── counterpoint.py    # Erros de contraponto/voice-leading
│   ├── score_info.py      # Metadados e visão geral
│   └── motifs.py          # Padrões motívicos recorrentes
└── utils/
    └── loader.py          # Carregar arquivos + helpers music21

---

💡 Exemplo de uso

# analyze_key
{
  "file_path": "/home/user/bach_prelude.mid",
  "response_format": "json"
}

# analyze_harmony com recorte de compasses
{
  "file_path": "/home/user/sonata.xml",
  "measures": [1, 16],
  "response_format": "markdown"
}

# analyze_motifs customizado
{
  "file_path": "/home/user/symphony.mid",
  "motif_length": 5,
  "min_occurrences": 3
}

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