This is the third in a series of articles on how to add “audio” (music or speech) to your PowerPoint presentations. The articles are designed for those of us who use PowerPoint 2000/2003 and who have neither the desire nor need to change to PowerPoint 2007.
In this article, we assume you want to play music from an audio file (such as an MP3 file) as background music to your presentation.
In the simplest case, you want the music to start playing from the first slide when the presentation begins and continue playing until the presentation ends.
Here’s how you can do this:
Open your presentation in PowerPoint; the first slide should be displayed. If you want the music to start from a different slide, just go to that slide.
From the menu bar at the top of the screen, click on Insert > Movies and Sounds > Sound from File...
(To see a larger view of any image, click on the image)

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This should bring up a box similar to the following:
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Navigate, if necessary, to the folder containing the file you want to use. Select the file and click OK. Note: PowerPoint lets you use music stored in almost all common file formats such as MIDI (.mid), MP3 (.mp3) and WAVE (.wav). When you click OK, the following will appear:

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If you choose “Automatically”, the music will start as soon as you begin your presentation. If you choose “When Clicked”, the music will start when you click on the “sound icon” that will be placed on your slide (see below). This allows you to choose exactly when you want the music to start. For now, assume you choose “Automatically”. The following icon (shown selected) will be placed on your slide. You can resize it or drag it to any convenient position on the slide.

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You are now ready to view your presentation. Press F5 (or select Slide Show > View Show) from the menu bar. The first slide comes up and the music starts to play. Suppose you advance to the next slide by clicking the mouse. Surprise! Surprise! The music stops. Not quite what we wanted, is it?