when making a presentation with PowerPoint, it is quite straightforward to change the background music. First, open your PPT, find and click the "insert" option on the menu bar, and then select the "sound" option in the drop-down menu.

Then, your computer will pop up a file selection window, here is all your available music file library. Browse and select the music you want to insert, and then click "OK" button. At this point, the software will automatically preview the selected music. You can choose to let it play automatically, or you need to click the mouse to trigger it when playing.

once the music is successfully inserted, you can see a small speaker icon on the slide, which means that your background music has been set. If you want to change music, just repeat the above steps, select a new music file and replace it. This setting makes it easy to change the background music and improves the audio-visual effect of the presentation.