> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mountsea.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Studio Add Section

> Phase 1 — generate candidate fills at an insert point

Insert a new section at `insert_at_s` via infill generation. Returns **2 candidates**. Poll [Get Task Status](/api-reference/suno/task) until `success`, then call [Add Section Commit](/api-reference/suno/studioAddSectionCommit).

<Info>
  **Billed** like music creation (`create`). Task result includes candidate `clips` plus Studio project context needed for phase 2.
</Info>

Part of the [Studio Editing](/api-reference/suno/studio) group.

## Parameters

| Field           | Type   | Required | Description                                         |
| --------------- | ------ | -------- | --------------------------------------------------- |
| `clip_id`       | string | Yes      | Source clip                                         |
| `insert_at_s`   | number | Yes      | Insert position in the original song (seconds)      |
| `duration_s`    | number | No       | New section length, 4–32 seconds (default `16`)     |
| `lyrics`        | string | No       | Lyrics for the new section; omit for instrumental   |
| `tags`          | string | No       | Style tags; inherits original style if omitted      |
| `negative_tags` | string | No       | Styles to exclude                                   |
| `model`         | string | No       | Model version (default `chirp-v55` / `chirp-fenix`) |
| `title`         | string | No       | Candidate title                                     |

## Example

```bash theme={null}
curl -X POST https://api.mountsea.ai/suno/v2/studio/addSection \
  -H "Authorization: Bearer your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "clip_id": "5a3c023f-d1ed-4a85-b61e-168dde2b6659",
    "insert_at_s": 32,
    "duration_s": 16,
    "lyrics": "[Bridge]\nTake me higher tonight",
    "tags": "Pop, Emotional",
    "model": "chirp-v55"
  }'
```

After polling succeeds, pick a candidate clip id and proceed to [Add Section Commit](/api-reference/suno/studioAddSectionCommit).


## OpenAPI

````yaml POST /suno/v2/studio/addSection
openapi: 3.0.0
info:
  title: Suno AI
  description: API documentation for Suno AI
  version: 1.0.0
  contact: {}
servers:
  - url: https://api.mountsea.ai
    description: API Gateway
security: []
tags:
  - name: suno
    description: ''
  - name: suno/studio
    description: Studio Song Editor（与 audio/crop|fade|reverse 独立）
paths:
  /suno/v2/studio/addSection:
    post:
      tags:
        - suno/studio
      summary: Studio add section (phase 1)
      description: >-
        在 insert_at_s 插入新段落，走 infill 生成 2 个候选（计费同创建音乐）。通过 clip_id 同账号选号。任务结果含
        clips + studio 上下文；选定后调 addSectionCommit。
      operationId: ApiStudioController_addSection
      parameters: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/StudioAddSectionDto'
      responses:
        '201':
          description: ''
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TaskIdDto'
      security:
        - bearerAuth: []
components:
  schemas:
    StudioAddSectionDto:
      type: object
      properties:
        clip_id:
          type: string
          description: 原歌曲 clip_id
        insert_at_s:
          type: number
          minimum: 0
          description: 在原曲的这个秒数处插入新段落
        duration_s:
          type: number
          minimum: 4
          maximum: 32
          description: 新段落时长，范围 4～32，默认 16
          default: 16
        lyrics:
          type: string
          description: 新段落歌词；不传则为纯音乐
        tags:
          type: string
          description: 风格；不传则继承原曲风格
        negative_tags:
          type: string
          description: 排除风格
        model:
          type: string
          description: 模型版本，默认 chirp-v55 / chirp-fenix
          example: chirp-v55
        title:
          type: string
          description: 候选标题
      required:
        - clip_id
        - insert_at_s
    TaskIdDto:
      type: object
      properties:
        taskId:
          type: string
          description: task id. Use this id to query task status.
          example: 15c257ff-43f7-4678-bd41-202ad6b8488b
      required:
        - taskId
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT

````