Media

Chord Progression Finder from Melodic Sketch

Enter a melodic contour as scale degrees (1-7 or do-re-mi) plus a target key, and get candidate diatonic chord progressions ranked by voice-leading smoothness, with roman-numeral analysis and an audio demo.

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Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/youtube-music-chord-finder' \
  -H 'Content-Type: application/json' \
  -d '{"melody":"1 3 5","tonic":"C","mode":"major","topN":6,"tempo":96}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/youtube-music-chord-finder

Parameters

Name	Type	Required	Description
melody	text	Yes	—
tonic	select	Yes	—
mode	select	Yes	—
topN	number	Yes	—
tempo	number	No	—

Response format

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-youtube-music-chord-finder": {
      "name": "youtube-music-chord-finder",
      "description": "Enter a melodic contour as scale degrees (1-7 or do-re-mi) plus a target key, and get candidate diatonic chord progressions ranked by voice-leading smoothness, with roman-numeral analysis and an audio demo.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=youtube-music-chord-finder",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "youtube-music-chord-finder",
    "arguments": {
  "melody": "1 3 5",
  "tonic": "C",
  "mode": "major",
  "topN": 6,
  "tempo": 96
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

Browse tools Open tool

Name

Type

Required

Description

melody

text

Yes

—

tonic

select

Yes

—

mode

select

Yes

—

topN

number

Yes

—

tempo

number

—

{ "mcpServers": { "elysiatools-youtube-music-chord-finder": { "name": "youtube-music-chord-finder", "description": "Enter a melodic contour as scale degrees (1-7 or do-re-mi) plus a target key, and get candidate diatonic chord progressions ranked by voice-leading smoothness, with roman-numeral analysis and an audio demo.", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=youtube-music-chord-finder", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "youtube-music-chord-finder", "arguments": { "melody": "1 3 5", "tonic": "C", "mode": "major", "topN": 6, "tempo": 96 } } }