# Meta MusicGen — API Reference

Model ID: `model_meta-musicgen`

---

## Authentication

Scenario API uses HTTP Basic Auth. Encode your credentials in Base64 and pass them as the `Authorization` header.

```
Authorization: Basic base64("<API_KEY>:<API_SECRET>")
```

- **API_KEY** and **API_SECRET** are found in your [Scenario Project Settings](https://app.scenario.com/team&tab=project_api_keys) under API Keys.
- In shell: `$(echo -n '<API_KEY>:<API_SECRET>' | base64)`
- In JavaScript: `btoa("<API_KEY>:<API_SECRET>")`
- In Python: `base64.b64encode(f"{api_key}:{api_secret}".encode()).decode()`

---

## Generate

**Endpoint:** `POST https://api.cloud.scenario.com/v1/generate/custom/model_meta-musicgen`

### Parameters

| Parameter | Type | Required | Default | Description |
|-----------|------|----------|---------|-------------|
| `modelVersion` | string | - | `stereo-melody-large` | Model to use for generation |
| `prompt` | string | - | - | A description of the music you want to generate. |
| `duration` | number | - | `8` | Duration of the generated audio in seconds. |
| `continuation` | boolean | - | `false` | If True, generated music will continue from Input Audio. Otherwise, generated music will mimic Input Audio's melody. |
| `continuationStart` | number | - | `0` | Start time of the audio file to use for continuation. |
| `continuationEnd` | number | - | - | End time of the audio file to use for continuation. If None, will default to the end of the audio clip. |
| `multiBandDiffusion` | boolean | - | `false` | If True, the EnCodec tokens will be decoded with MultiBand Diffusion. Only works with non-stereo models. |
| `normalizationStrategy` | string | - | `loudness` | Strategy for normalizing audio. |
| `temperature` | number | - | `1` | Controls the 'conservativeness' of the sampling process. Higher temperature means more diversity. |
| `classifierFreeGuidance` | number | - | `3` | Increases the influence of inputs on the output. Higher values produce lower-varience outputs that adhere more closely to inputs. |
| `seed` | number | - | - | Seed for random number generator. If None or -1, a random seed will be used. |

### Example Requests

**cURL**

```bash
curl -X POST "https://api.cloud.scenario.com/v1/generate/custom/model_meta-musicgen" \
  -H "Authorization: Basic $(echo -n '<API_KEY>:<API_SECRET>' | base64)" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'EOF'
{
  "modelVersion": "stereo-melody-large",
  "duration": 8,
  "continuation": false,
  "continuationStart": 0,
  "multiBandDiffusion": false,
  "normalizationStrategy": "loudness",
  "temperature": 1,
  "classifierFreeGuidance": 3
}
EOF
```

**Python**

```python
import requests
import base64

api_key = "<API_KEY>"
api_secret = "<API_SECRET>"
token = base64.b64encode(f"{api_key}:{api_secret}".encode()).decode()

url = "https://api.cloud.scenario.com/v1/generate/custom/model_meta-musicgen"
headers = {
    "Authorization": f"Basic {token}",
    "Content-Type": "application/json"
}
payload = {
    "modelVersion": "stereo-melody-large",
    "duration": 8,
    "continuation": False,
    "continuationStart": 0,
    "multiBandDiffusion": False,
    "normalizationStrategy": "loudness",
    "temperature": 1,
    "classifierFreeGuidance": 3
}

response = requests.post(url, headers=headers, json=payload)
print(response.json())
```

**JavaScript**

```javascript
const token = btoa("<API_KEY>:<API_SECRET>");

const body = {
  "modelVersion": "stereo-melody-large",
  "duration": 8,
  "continuation": false,
  "continuationStart": 0,
  "multiBandDiffusion": false,
  "normalizationStrategy": "loudness",
  "temperature": 1,
  "classifierFreeGuidance": 3
};

const response = await fetch(
  "https://api.cloud.scenario.com/v1/generate/custom/model_meta-musicgen",
  {
    method: "POST",
    headers: {
      "Authorization": `Basic ${token}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify(body),
  }
);

const data = await response.json();
console.log(data);
```

---

## Retrieve Results

After submitting a generation request, you receive a `jobId`. Poll the job status endpoint until the job completes.

**Endpoint:** `GET https://api.cloud.scenario.com/v1/jobs/{jobId}`

**Headers:**
```
Authorization: Basic base64("<API_KEY>:<API_SECRET>")
```

Poll until `job.status` is `"success"`. The generated asset IDs are in `job.metadata.assetIds`.

**Example response:**
```json
{
  "job": {
    "jobId": "job_abc123",
    "status": "success",
    "metadata": {
      "assetIds": [
        "asset_abc123"
      ]
    }
  }
}
```

> **Important:** Generated asset URLs are **temporary** and expire after a short period. Download and store any images you wish to keep before the URL expires. More info: [Content Delivery Network (CDN)](https://docs.scenario.com/docs/content-delivery-network-cdn).

---

*Generated by [Scenario](https://app.scenario.com)*