How to add background music to audio:

Method 1: Rainbow Office Center.

1. We need to download and install the Rainbow Office Center software on the Internet. Double-click to open the Rainbow Office Center. We can see that rich audio file processing functions can be found here. In order to add audio background music we click Audio Processing - Add Background Music.

2. We can add the audio files we need to the software by clicking Add Files. Of course, if you find it troublesome, you can also drag and drop them directly into the software. When we need to import multiple audio files, we can also click the CTRL key to add multiple audio files to the software.