In "Mini World", the following steps are required to export music:

1. Use the automatic performance function of the instrument. In "Mini World", use various musical instruments to perform automatically. Choose an instrument and play it.

2. Add new music scores in the audio library of the resource library. The music score must be in MIDI audio format, and the file suffix is ??.mid.

3. Select the main melody. Each song has multiple tracks, which you can listen to and choose the one that stands out as the main melody.

4. After determining the main melody, click Confirm to export. Once confirmed, you can export it.