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Remember: As far as possible, work with a presentation that has been saved at least once; then copy any sound/music file you want to loop to the same folder as the presentation as you can see in Figure 1 -- and then follow these steps.

Figure 1: PowerPoint presentation and sound file

Follow these steps to loop a music (or any sound) file across slides in PowerPoint 2007:

1. Navigate to the slide where you want the sound to begin playing, which is usually the first slide of the presentation. On the Insert tab of the Ribbon choose Sound | Sound from files. as shown in Figure 2.
   
   
   Figure 2: Sound from file
   
   
2. This opens the Insert Sound dialog box as shown in Figure 3. Locate the sound file you want to play, and click OK.
   
   
   Figure 3: Insert Sound
   
   
3. This will insert the sound in the slide -- Figure 4 shows the inserted sound icon that you'll probably find right in the center of the slide and at the same time PowerPoint brings up a message window asking how you want the sound to start in the slideshow. You can choose the When Clicked option, but Automatically works best -- so go ahead and select Automatically.
   
   
   Figure 4: Play automatically
   
   
4. Select the sound icon to activate the Sound Tools Options tab on the Ribbon as shown in Figure 5
   
   
   Figure 5: Options tab of the Ribbon
   
   
5. In the Sound Options group, click the Play Sound drop down list and choose Play across Slides (see Figure 6).
   
   
   Figure 6: Play across Slides
   
   
6. Select the Loop until Stopped option on the Sound Options group as shown in Figure 7.
   
   
   Figure 7: Loop until Stopped
   
   
7. In all versions of PowerPoint, you might see a sound icon on the slide where you inserted the sound - if you don't like the icon on the slide, just drag it to anywhere off the slide - your sound shall still play fine.
   
   
   
   Tip: Save your presentation often!

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