curl -X POST 'https://api.elevenlabs.io/v1/music/plan' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "prompt": "string",
  "music_length_ms": 0,
  "source_composition_plan": {
    "negative_global_styles": [
      "metal",
      "hip-hop",
      "country"
    ],
    "positive_global_styles": [
      "pop",
      "rock",
      "jazz"
    ],
    "sections": [
      {
        "duration_ms": 10000,
        "lines": [
          "Verse 1 lyrics"
        ],
        "negative_local_styles": [
          "metal",
          "hip-hop",
          "country"
        ],
        "positive_local_styles": [
          "pop",
          "rock",
          "jazz"
        ],
        "section_name": "Verse 1"
      }
    ]
  },
  "model_id": "music_v1"
}'

# POST /v1/music/plan (ElevenLabs API)
Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03

> Generate Composition Plan

## Critical Gotchas
* Authentication uses the non-standard `xi-api-key` header, not `Authorization: Bearer`. Sending a Bearer token returns HTTP 401.
* Text-to-speech responses are raw binary audio, not JSON. Write the body to a file (`--output speech.mp3`) rather than parsing it.

## cURL
curl -X POST 'https://api.elevenlabs.io/v1/music/plan' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"prompt":"string","music_length_ms":0}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| prompt | body | string | Yes | A simple text prompt to compose a pla... |
| music_length_ms | body | integer | No | The length of the composition plan to... |
| source_composition_plan | body | object | No | An optional composition plan to use a... |

## Response (200 OK)
{"negative_global_styles":["metal"],"positive_global_styles":["pop"]}

---
Need an API key? Get one at https://elevenlabs.io/app/sign-up

POST

/v1/music/plan

ElevenLabs API

Generate Composition Plan

Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03 · upstream hash matched

Actions

Agents: curl -H "Accept: text/markdown" this URL
→ 216 tokens · Vary: Accept

Critical gotchas

Authentication uses the non-standard xi-api-key header, not Authorization: Bearer. Sending a Bearer token returns HTTP 401.

Text-to-speech responses are raw binary audio, not JSON. Write the body to a file (--output speech.mp3) rather than parsing it.

cURL

curl -X POST 'https://api.elevenlabs.io/v1/music/plan' \  -H "xi-api-key: $ELEVENLABS_API_KEY" \  -H 'Content-Type: application/json' \  -d '{  "prompt": "string",  "music_length_ms": 0,  "source_composition_plan": {    "negative_global_styles": [      "metal",      "hip-hop",      "country"    ],    "positive_global_styles": [      "pop",      "rock",      "jazz"    ],    "sections": [      {        "duration_ms": 10000,        "lines": [          "Verse 1 lyrics"        ],        "negative_local_styles": [          "metal",          "hip-hop",          "country"        ],        "positive_local_styles": [          "pop",          "rock",          "jazz"        ],        "section_name": "Verse 1"      }    ]  },  "model_id": "music_v1"}'

Get a free ElevenLabs API key → sponsored

Parameters

Name	In	Type	Required	Description
prompt	body	string	Yes	A simple text prompt to compose a plan from.
music_length_ms	body	integer	No	The length of the composition plan to generate in milliseconds. Must be between 3000ms and 600000ms. Optional - if not provided, the model will choose a length based on the prompt.
source_composition_plan	body	object	No	An optional composition plan to use as a source for the new composition plan.
model_id	body	string	No	Request body field model_id.

Response 200 OK

{
  "negative_global_styles": [
    "metal",
    "hip-hop",
    "country"
  ],
  "positive_global_styles": [
    "pop",
    "rock",
    "jazz"
  ],
  "sections": [
    {
      "duration_ms": 10000,
      "lines": [
        "Verse 1 lyrics"
      ],
      "negative_local_styles": [
        "metal",
        "hip-hop",
        "country"
      ],
      "positive_local_styles": [
        "pop",
        "rock",
        "jazz"
      ],
      "section_name": "Verse 1"
    }
  ]
}