If your story is going to be published on the internet, it is very important to use copyright-free music.
Photo Story Photo Story 3 will let you  with the window below. If you do not wish your music to be continuous the Create Music has a Silence option you can add to the section you need to be quiet.  | Download You can also 
and add this to PhotoStory using the Select Music button. Whichever you choose the music will start on the selected images  | Remember: your music is there to add atmosphere and should not have lyrics or be too loud.  The story is the most important part of your video the music must not get in the way! |