The difference between the bars "Audio" and "Audio/Music"
In the "Audio" bar, you can see the sound that was automatically recorded during the recording. If you would like to add other audio or a voice, this will be added to the "Audio / Music" bar.
To add extra sound to the movie, import and drag an MP3 file or other audio file (one that is suitable for the editing program) to the bar "Audio / Music":
Importing sound in Windows Movie Maker
To import sound, click on the "Import audio or music" and browse to the audio files on your computer that you want to import.
