Methods/Steps:
1. First, open the document to which you want to add background music, and click the "View" menu;
2. select the "header and footer" command to switch to the footer editing status;
3. Then open the Object command under the Insert menu, and select WindowsMediaPlayer in the object type to insert a WMP object;
4. Right-click the inserted object, select the "Properties" command, and click the "Customize" button at the top of the opened properties window;
5. then click the browse button after "customize" and set the file name or URL of the source in the opened window, that is, click the browse button to add the file to be played automatically;
6. At the same time, set "Selection Mode" to "Invisible", set "Play Option" to "Auto Start", and set "Play Count" as required;
7. click "ok" to save the settings, return to the main interface and save the Word document.
This is the way to add background music to p>Word documents. Thank you for your attention and support!