Adding music to slide presentation

I am new to powerpoint... I am creating a slideshow with scanned pictures as the content of every slide.

I would like also to add a music that will be played while the slideshow is running, I have inserted a music file, but when i tried to run the slideshow, the music plays only on the first slide. What shall I do in order that one music would already be played for several pictures.

Thank you for any advice that you can share for a newbie in powerpoint.

To adjust the settings for stopping your sound file, click the sound icon on the slide (after you've inserted the music), right-click, and then select Custom Animation.
In the Custom Animation task pane, either double-click the music item in the list, or right-click and then select Effect Options.
To keep the sound file playing for several slides, select After, and then set the total number of slides the file should play on.
Using the other tabs in the same dialog box you can also adjust timings to start sounds and whether the sound should repeat after it finishes.