# Meta MusicGen — API Reference

Model ID: `model_meta-musicgen`

---

## Authentication

- **API_KEY** and **API_SECRET** are found in your [Scenario Project Settings](https://app.scenario.com/team&tab=project_api_keys) under API Keys.
- Set them as environment variables `SCENARIO_SDK_API_KEY` and `SCENARIO_SDK_API_SECRET` — both SDKs pick them up by default.
- For raw HTTP (cURL), use Basic Auth: `Authorization: Basic base64("<API_KEY>:<API_SECRET>")`.

### Install the SDK

- JavaScript / TypeScript: `npm install @scenario-labs/sdk`
- Python: `pip install scenario-sdk`

---

## 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. |
| `inputAudio` | assetId | - | - | An audio file that will influence the generated music. If `continuation` is `True`, the generated music will be a continuation of the audio file. Otherwise, the generated music will mimic the audio file's melody. Only works with Melody Large and Stereo Melody Large models. |
| `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 os
from scenario_sdk import Scenario

client = Scenario(
    api_key=os.environ.get("SCENARIO_SDK_API_KEY"),
    api_secret=os.environ.get("SCENARIO_SDK_API_SECRET"),
)

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

response = client.generate.run_model(
    model_id="model_meta-musicgen",
    body=body,
)
print(response)
```

**JavaScript**

```javascript
import Scenario from "@scenario-labs/sdk";

const client = new Scenario({
  apiKey: process.env["SCENARIO_SDK_API_KEY"],
  apiSecret: process.env["SCENARIO_SDK_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 client.generate.runModel("model_meta-musicgen", { body });
console.info(response);
```

---

## Retrieve Results

After submitting a generation request, you receive a `jobId`. Poll the job until `job.status` is `"success"`. The generated asset IDs are in `job.metadata.assetIds`.

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

### Example Requests

**cURL**

```bash
curl -X GET "https://api.cloud.scenario.com/v1/jobs/<JOB_ID>" \
  -H "Authorization: Basic $(echo -n '<API_KEY>:<API_SECRET>' | base64)"
```

**Python**

```python
job = client.jobs.retrieve(job_id="<JOB_ID>")
print(job.status)
print(job.metadata.asset_ids)
```

**JavaScript**

```javascript
// Option 1 — wait on the response from runModel using the SDK helper
const completed = await response.job.wait();
console.info(completed.status);
console.info(completed.metadata?.assetIds);

// Option 2 — retrieve a job by its ID
const job = await client.jobs.retrieve("<JOB_ID>");
console.info(job.status);
console.info(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/get-started/documentation/content-delivery-network-cdn).

---

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