Extend music

Continue generating a track from a specified point; continue_at is measured in seconds.

music_id is the track ID, which you can obtain from Upload reference audio. continue_at must be greater than or equal to 0. After submission, use Retrieve a task to read the result.

POST/suno/mj/submit/extend

Authorization

bearerAuth

AuthorizationBearer <token>

Authenticate with Authorization: Bearer your-api-key.

In: header

Request Body

application/json

TypeScript Definitions

Use the request body type in TypeScript.

music_id*string

ID of the track to extend.

continue_at*number

Starting point for the extension in seconds; must be greater than or equal to 0.

Range0 <= value

custom*boolean

Whether to use custom mode. The request is rejected if this field is omitted.

gpt_description_prompt?string

Required when custom=false; maximum length is 500 characters.

Lengthlength <= 500

prompt?string

Required when custom=true; used as the continuation lyrics or prompt.

title?string

Title, with a maximum length of 80 characters.

Lengthlength <= 80

tags?string

Music style.

negative_tags?string

Negative tags.

style_weight?number

Each value ranges from 0 to 1.

Range0 <= value <= 1

weirdness_constraint?number

Each value ranges from 0 to 1.

Range0 <= value <= 1

audio_weight?number

Each value ranges from 0 to 1.

Range0 <= value <= 1

auto_lyrics?boolean

Whether to generate lyrics automatically.

vocal_gender?string

Supports only Male or Female.

Value in

"Male"
"Female"

persona_id?string

Persona ID。

isStorage?boolean

Whether to save a copy.

hookUrl?string

Optional user callback URL. Only ports 80, 443, 8080, and 8443 are supported. When provided, the platform forwards notifications to it.

Response Body

`application/json`

curl --request POST 'https://api.agtcloud.cn/suno/mj/submit/extend' \
  --header 'Authorization: Bearer your-api-key' \
  --header 'Content-Type: application/json' \
  --data '{
  "music_id": "MUSIC_ID",
  "continue_at": 62.5,
  "custom": true,
  "prompt": "Continue the previous chorus with stronger drums and a choir",
  "title": "Dusk on Elm Extended",
  "tags": "cinematic pop, choir"
}'

{
  "status": "SUCCESS",
  "message": "success",
  "data": {
    "jobId": "JOB_ID"
  }
}

Authorization

Request Body

Response Body

200application/json

400application/json

`application/json`

`application/json`