THIRI Chord Intelligence MCP server

THIRI is a music theory helper for your AI. It answers chord and harmony questions with real calculations instead of guesses. It is handy if you write songs, study jazz, or use AI to make music and want the theory to be right.

What this MCP server does

You ask your AI something like what notes are in a chord or how to reharmonize a progression. The AI passes that to the THIRI helper. THIRI does the music theory math and sends back the spelled notes, roman numerals, voicings, or a new chord progression. Your AI then shows you the result in the chat.

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What you can do with it

• Analyze any chord to get its root, quality, intervals, and roman numeral
• Resolve a chord into correctly spelled notes, frequencies, and MIDI numbers
• Generate instrument-ready voicings like rootless, shell, or drop-2
• Voice-lead one chord into the next and get a score
• Reharmonize a progression using techniques like tritone substitution or Coltrane changes
• Get scale recommendations for a chord in a key

Try asking your AI

• “Analyze Dm7b5 in C.”
• “What notes are in C7sus4?”
• “Give me a rootless Cmaj7 voicing, then voice-lead into Dm7.”
• “Reharmonize Dm7 G7 Cmaj7 with Coltrane changes.”

What it gives back to you

You get clear answers in the chat: the spelled notes of a chord, its roman numeral and function, a list of voicings, or a new chord progression. For voicings you also get a voice-leading score. Everything is computed, so the notes and labels are correct.

Before you start

Who it's for

Musicians, songwriters, music students, and anyone using AI to work with chords and harmony.