> ## Documentation Index > Fetch the complete documentation index at: https://docs.goenhance.ai/llms.txt > Use this file to discover all available pages before exploring further. # Cadence Cover > Cover an existing song: the lead melody of `audio_url` is kept, and your `lyrics` are sung over a new arrangement in the `style` you describe. - The song needs a clear lead vocal melody. To keep the original lyrics, paste them into `lyrics`. - The cover follows the length of the original song, which is also the billed length. - The cover stays in the key of the original: a style asking for a male voice over a song sung in a female range still sings in that range. **Pricing**: 0.02 tokens ($0.0004) per second of audio, rounded up to the whole second. | Option | Tokens | USD | |---|---|---| | Per second of audio | 0.02 | $0.0004 | **Result**: one `json` item `{ "type": "audio", "value": "https://...mp3" }` (a `.wav` link when `output_format` is `wav`), 48 kHz stereo. Result links expire (see `link_expired_at`). ## OpenAPI ````yaml api-reference/audio-generations/openapi-cadence-cover.json POST /api/v1/audio/generations openapi: 3.1.0 info: title: GoEnhance API - Cadence Cover description: Re-sing and re-arrange a song in a new style, keeping its melody. version: 1.0.0 servers: - url: https://api.goenhance.ai security: [] paths: /api/v1/audio/generations: post: tags: - AudioGenerations summary: Cadence Cover description: >- Cover an existing song: the lead melody of `audio_url` is kept, and your `lyrics` are sung over a new arrangement in the `style` you describe. - The song needs a clear lead vocal melody. To keep the original lyrics, paste them into `lyrics`. - The cover follows the length of the original song, which is also the billed length. - The cover stays in the key of the original: a style asking for a male voice over a song sung in a female range still sings in that range. **Pricing**: 0.02 tokens ($0.0004) per second of audio, rounded up to the whole second. | Option | Tokens | USD | |---|---|---| | Per second of audio | 0.02 | $0.0004 | **Result**: one `json` item `{ "type": "audio", "value": "https://...mp3" }` (a `.wav` link when `output_format` is `wav`), 48 kHz stereo. Result links expire (see `link_expired_at`). parameters: - name: Authorization in: header description: '' required: false example: '{{Authorization}}' schema: type: string requestBody: content: application/json: schema: type: object properties: model: type: string enum: - cadence-cover description: Model name. Must be `cadence-cover`. audio_url: type: string format: uri description: >- The original song. A public `https://` link to an audio file (mp3, m4a, wav, flac, ogg; a video link uses its audio track), 5 to 360 seconds, up to 20 MB. mp3 or m4a is recommended: a full 6-minute song fits, while wav over about 1 minute 50 seconds or flac over about 3.5 minutes exceeds the limit. Its length is measured before the task is accepted and is the billed length. style: type: string maxLength: 1000 description: >- Describe the music: language, genre, instruments, vocal, mood and tempo, comma-separated works best, e.g. `Mandarin pop, warm female vocal, piano, strings, 90 BPM, emotional`. Max 1000 characters. lyrics: type: string maxLength: 4000 description: >- Lyrics to sing over the original melody, with `\n` between lines. Section tags such as `[Verse]` and `[Chorus]` are recommended. Max 4000 characters. seed: type: integer minimum: 0 maximum: 2147483647 description: >- Optional. The same seed and inputs give the same result. Random when omitted. output_format: type: string enum: - mp3 - wav default: mp3 description: '`mp3` (320 kbps, default) or `wav` (16-bit). 48 kHz stereo.' custom_callback_url: type: string format: uri description: >- Optional. A publicly accessible HTTPS URL. When the task status changes (processing / success / failed), GoEnhance sends a POST request to this URL. The request body is identical to the response of GET /api/v1/jobs/detail. If your server does not respond with HTTP 200, the notification is retried up to 3 times, with a 3-second timeout per attempt. example: https://your-server.com/goenhance/callback required: - model - audio_url - style - lyrics example: model: cadence-cover audio_url: https://example.com/original-song.mp3 style: Bossa nova, soft female vocal, nylon guitar, light percussion lyrics: |- [Verse] Moonlight on the window pane I write your name again [Chorus] When the wind comes from the sea You'll come back to me responses: '200': description: '' content: application/json: schema: type: object properties: code: type: integer msg: type: string data: type: object properties: img_uuid: type: string cost: type: number description: >- Tokens deducted for this request. This is the amount actually charged, so it already reflects any discount active on your account and can be lower than the listed price. Tokens are deducted when the task is accepted, and refunded automatically if the generation ends in failure. example: 0.86 required: - img_uuid - cost required: - code - msg - data examples: '1': summary: Success value: code: 0 msg: Success data: img_uuid: c12b656c-747a-44fd-9c80-add79b0c52d5 cost: 0.86 '2': summary: Insufficient tokens value: code: 100 msg: tokens is not enough quota: summary: API key quota exceeded value: code: 101 msg: 'API key quota exceeded: 4990 of 5000 tokens used (monthly)' bad: summary: Invalid parameters value: code: -1 msg: audio_url is too long. Max 360 seconds, got 412.3s headers: {} '401': description: '' content: application/json: schema: type: object properties: code: type: integer msg: type: string headers: {} deprecated: false ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.