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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.
Upload Cover supports persona_model (style_persona or voice_persona) with persona_id only in Custom Mode on V5/V5_5. It also supports integer duration from 10–360 only when custom_mode: true and mv: V5_5.

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Usage Guide

  • This endpoint transforms an uploaded audio track into a new style while preserving the original melody
  • Upload your audio file and specify the desired transformation style
  • The original melody and structure are maintained while applying new musical characteristics

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Parameter Details

  • Audio Upload Requirement:
    • The uploaded audio must not exceed 8 minutes in length
    • Note: For the V4_5ALL model, the uploaded audio must not exceed 1 minute in length
    • Provide a valid URL pointing to your audio file via upload_url
  • In Custom Mode ( custom_mode: true ):
    • style and title are required
    • prompt is required if instrumental is false
    • Character limits vary by model:
      • V4: prompt 3000 characters, style 200 characters, title 80 characters
      • V4_5 & V4_5PLUS: prompt 5000 characters, style 1000 characters, title 100 characters
      • V4_5ALL: prompt 5000 characters, style 1000 characters, title 80 characters
      • V5: prompt 5000 characters, style 1000 characters, title 100 characters
      • V5_5: prompt 5000 characters, style 1000 characters, title 100 characters
  • In Non-custom Mode ( custom_mode: false ):
    • prompt is required to describe the desired transformation (max 500 characters)
    • style and title should be left empty

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Developer Notes

  • Ensure your audio URL is publicly accessible and the file is under 8 minutes (1 minute for V4_5ALL)
  • For best results, use high-quality source audio with clear melody lines
  • The audio_weight parameter can help balance between preserving the original and applying the new style

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Optional parameters

  • negative_tags (string): Music styles or characteristics to exclude from the cover.
  • vocal_gender (string): Vocal gender preference. Use m for male, f for female. Note: This parameter increases the probability but cannot guarantee adherence.
  • style_weight (number): Strength of adherence to the new 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 preserving original audio features. Range 0-1, up to 2 decimals.
  • persona_id (string): Persona ID to apply to the covered track. Only available when custom_mode: true with V5/V5_5. How to generate persona_id, visit generate-persona.
  • persona_model (string): style_persona or voice_persona. Requires persona_id, custom_mode: true, and V5/V5_5.

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 upload-and-cover-audio for this endpoint.

Available options:
upload-and-cover-audio
Example:

"upload-and-cover-audio"

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input
object
required

Input parameters for audio cover generation

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callback_url
string<uri>

Webhook callback URL for result notifications.

Endpoint that receives task completion updates.

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