1. Download a software called GoldWave from the Internet and install it. After opening it, you can find an insertion control window on the right end of the program, where you can use the functional area to pause music and other control operations. As shown in the picture.

2. Select the "Open" button in the toolbar to open a music file to be processed. As shown in the picture.

3. At this time, you can see the sound wave diagram of this music in the program interface, as shown below. Click the "Open" button in the toolbar again to open another file you want to insert into the middle of the music. As shown in the picture.

4. At this time, the sonogram windows of two music files will appear on the program interface. As shown in the picture.

5. Suppose you want to insert a piece of music from the song above into the middle of the music file below. First, use the mouse box selection method to select the music fragment to be inserted in the song above, and then select "Copy" in the toolbar. As shown in the picture.

6. Position the mouse at the location where the music is to be inserted, and click the "Paste" button in the toolbar. The previously copied music clip will be pasted at the location where the mouse is positioned. As shown in the picture.

7. After insertion, the newly inserted music clip will be highlighted. If it is correct, just save the file. As shown in the picture.