MCP For Claude Marketplace
Relative & Parallel Key Finder

Relative & Parallel Key Finder MCP Connector for Claude

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Instantly discover relative, parallel, and related musical keys based on any input key.

3 tools Official Updated Oct 1, 2026 Official Vinkius Partner
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The Relative & Parallel Key Finder is a powerful music theory utility that connects AI agents to the structural relationships of Western music. By using tools like find_key_relationships, you can instantly identify relative and parallel keys, homonymous keys, and keys at a third-distance interval. You can also use get_signature_details to inspect the technical composition of any key's signature (sharps, flats, or none) and lookup_modulation_guide to access a complete reference table for modulation planning. This MCP server acts as a bridge between your AI assistant and complex music theory logic, making it perfect for composers, students, and musicians working in Cursor, VS Code, Claude Desktop, or Windsurf.

music-theorycompositionkey-signaturesmodulationmusicians

3 tools expose this connector's capabilities to your AI agent.

lookup_modulation_guide

Provides a comprehensive reference table of all key signatures

find_key_relationships

Returns relative, parallel, antiparallel, homonymous, and third-distance keys. Provides a complete set of relations for a given key

get_signature_details

Returns accidental count, type (sharps/flats/none), and mode. Describes the technical composition of a key's signature

See how to talk to your AI agent using Relative & Parallel Key Finder.

What is the relative and parallel key of G Major?

The relative key of G Major is E Minor, and its parallel key is G Minor.

How many sharps are in the key of D Major?

D Major has 2 sharps (F# and C#).

Show me all keys that share the same tonic as Eb Major.

The homonymous keys for Eb Major are Eb Major and Eb Minor.

You can use the `find_key_relationships` tool with 'C Major' as the input. It will return A Minor as the relative key.

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