Extend an existing music track

POST

https://api.musicapi.ai/api/v1/producer/create

Extend a previously generated or uploaded clip from a specific timestamp. The new content is appended starting at starts_at and runs for length seconds.

Auto-refund: if the upstream extension fails, the 12-credit charge is automatically refunded.

Migration note

This operation replaced the legacy Producer extend endpoint in 2026-04. The old starts (number) and lyrics_text parameters are still accepted but you should prefer starts_at, lyrics, and the new instruction / length fields.

Request

Authorization

Bearer Token

Provide your bearer token in the

Authorization

header when making requests to protected resources.

Example:

Authorization: Bearer ********************

Body Params application/jsonRequired

Examples

With explicit instruction (recommended)Legacy fallback — instruction synthesized from sound/lyricsRock song extensionAmbient outro

{
    "task_type": "extend_music",
    "clip_id": "abc123xyz789",
    "starts_at": 45,
    "instruction": "Add soaring violin strings and an uplifting orchestral build with increasing intensity. Conclude with a triumphant final chord.",
    "length": 30
}

Request Code Samples

Shell

JavaScript

Java

Swift

PHP

Python

HTTP

Objective-C

Ruby

OCaml

Dart

cURL

With explicit instruction (recommended)Legacy fallback — instruction synthesized from sound/lyricsRock song extensionAmbient outro

curl --location --request POST 'https://api.musicapi.ai/api/v1/producer/create' \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data-raw '{
    "task_type": "extend_music",
    "clip_id": "abc123xyz789",
    "starts_at": 45,
    "instruction": "Add soaring violin strings and an uplifting orchestral build with increasing intensity. Conclude with a triumphant final chord.",
    "length": 30
}'

Responses

🟢200

application/json

Task accepted. Poll GET /api/v1/producer/task/{task_id} for the result.

Body

Example

{
    "message": "success",
    "task_id": "29906f02-2366-4218-b25a-41458e1d60e0"
}

🟠400

🟠401

🟠403

🔴500

Modified at 2026-04-27 16:23:36

get music

Replace a section of an existing music track

Extend an existing music track

Migration note#

Request

Request Code Samples

Responses

Migration note