1. First, double-click to open the imovie application, and click the plus sign in the upper left corner to create a new movie.

2. Next, you need to click the Import Media button in the media box.

3. After that, you need to drag the music clip to the timeline to add music to the video.

4. Next, import the music you want, and then drag it into the material box.

5. You can also add music by dragging it to the timeline.