How to put a song in a powerpoint presentation?

I am making something for my sister on powerpoint for christmas and I cant figure out how to put the song that I want onto the powerpoint presintation...I have tried uploading it to the presintation..but its not working right... help please!!!

You can integrate the music file into the power point presentation. However, doing so will also increase the total file size of your eventual power point file. So I suggest you to convert the music file into a lower bitrate for a smaller file size. Also, power point only accept *.wav files so you will have to save it as a *.wav file.

1. Open up power point. Any version will work because it's the standard procedure. However I'm talking about Microsoft Power Point and not OpenOffice or any other office software alternatives.
2. Click Slide Show for a drop down menu.
3. Click Slide Transition. This is the place where you put all your slide animations when transitioning to the next slide. Notice that there is also an option where you can place a sound. Refer to next point.
4. Search for an option that allows you to place a sound. Scroll to the last option in the drop down menu to browse for your own sounds. Note that power point only accept *.wav sound files as background music. You have have to convert to *.wav in a lower bitrate.
5. In the first slide you place a sound, after transitioning to the next slide the sound will not stop playing until you place a new sound in a new slide. So if you want your background music to play through the entire presentation without stopping, simply add the sound in the first slide and none for the rest of the slides.

Steps:
1. Open PowerPoint and display the slide where you want the music to begin. On the Insert menu, point to Movies and Sounds, and then click Sound from File. Locate the folder that contains the sound file and then double-click the file you want.
2. When a message is displayed, click to play the music or sound automatically.
3. click the sound icon , right-click, and on the shortcut menu, click Custom Animation.
4. In the Custom Animation task pane, click the arrow on the selected item in the Custom Animation list, and then click Effect Options.
5. On the Effect tab, under Stop playing, choose to keep the sound file playing for several slides, click After, and then set the total number of slides the file should play through.
6. If you do not want the to appear during the show then drag it outside of the viewing area.

Tips:
Free and easy method:
Use PPT2Flash (http://www.sameshow.com/powerpoint-to-flash-pro.html#110) to add backgroud music with one click. Use this free trial one, you also can insert Flash for free.
It saves a lot of time for my daily work.