If you would like to add some music to your slideshow presentation, PowerPoint 2013 gives you three options. You can add your own music files from your computer, select music clips from Office.com, or record music yourself using your computer’s microphone. Once the music is added, select how it should play using the customization options provided.
Launch PowerPoint and create a new or existing presentation file. Click the "Insert" tab, then select "Audio" from the Media group.
Select your audio source from the Audio drop-down menu. Click "Audio on My PC" to load your own song file from your computer. Click "Record Audio" to access your computer's microphone and record your own music within PowerPoint. To use free music clips from Office.com, click "Online Audio." There are about 1,000 music clips to choose from.
Click the "Style" icon to have the music play automatically in the background when the slide opens, or select "No Style" to have the music play only when its icon is clicked.
Click the "Trim" option after right-clicking the Audio icon to make the audio clip shorter. You can enter the start and end times in the appropriate text boxes or just drag the sliders on each end of the audio clip to change its playing time.
Click the sound clip in the Animation Pane and then click the "Arrow" that appears beside it. Many of these options relate to syncing the music with other animation effects. For example, if you have additional animation on the same slide, such as a video or effect, you can select to start the music either with that animation or after it. Click either "Effect Options" or "Timing" to open the Play Audio window.
Click the "Effect" tab in the Play Audio window. Here, you can select when you want the audio to start and stop playing. For example, the audio can end after this slide or another slide, or stop whenever you click the mouse.