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POST
  1. After submission, a task_id will be returned. If you provided a callback_url, when the task status becomes finished or failed, a POST request will be sent to the callback_url.
  2. Regardless of whether callback_url is provided, you can retrieve the response result through the unified Query Music Detail endpoint.

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Usage Guide

  • This endpoint generates musical accompaniment for uploaded audio files
  • Typically used with vocal stems or melodies to create backing tracks
  • Perfect for adding instrumental layers to existing recordings without needing a producer

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Parameter Details

  • Required parameters:
    • upload_url: URL of the audio file to process
    • title: Name for the generated track
    • tags: Desired musical styles (e.g., “relaxing, piano, soothing”)
    • negative_tags: Styles to exclude (e.g., “heavy metal, fast drums”)
  • Model selection:
    • V5: Superior musical expressiveness with faster generation
    • V4_5PLUS: Enhanced tonal richness (default)

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Developer Notes

  • Use descriptive tags to guide the style of the instrumental
  • Combine positive and negative tags for precise control over the output
  • The callback mechanism sends notifications at three stages: text generation, first track completion, and all tracks completed

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Optional parameters

  • model (string): AI model version. Options: V4_5PLUS (default), V5.
  • vocal_gender (string): Vocal gender preference. Use m for male, f for female. Note: This parameter can only increase the probability but cannot guarantee the specified gender.
  • style_weight (number): Strength of adherence to style. Range 0-1, up to 2 decimals.
  • weirdness_constraint (number): Controls creative deviation. Range 0-1, up to 2 decimals.
  • audio_weight (number): Balance weight for audio features. Range 0-1, up to 2 decimals.

Authorizations

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Authorization
string
header
required

All API endpoints require Bearer Token authentication

Get your API Key:

Visit the API Key Management Page to get your API Key

Add it to the request header:

Body

application/json
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model
enum<string>
required

API model identifier.

Must be add-instrumental for this endpoint.

Available options:
add-instrumental
Example:

"add-instrumental"

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input
object
required

Input parameters for instrumental generation

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callback_url
string<uri>

Webhook callback URL for result notifications

Example:

"https://your-domain.com/callback"

Response

200 - application/json

Task submitted successfully

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code
integer
required

HTTP status code

Example:

200

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data
object
required