Flash Gallery Maker-a wonderful photo album maker, photo slideshow builder and flash slideshow creator
Flash Gallery Maker supports MP3, WMA and WAV audio formats. You can also grab sound tracks from CD as the background music.
Firstly, launch this software and switch to the “Theme” tab, on the bottom-right of the panel, you can see the three buttons like "+","-" and "Get from CD". You can click any one of them to add background music
In brief, It is so easy. Just one sight, I'm sure you can complete it very well..