If your slide show is longer than one song, you can add more songs. ![]() Play multiple songs across multiple slides Play in Background makes the audio file start automatically during a slide show and also makes the audio play across multiple slides. With the audio icon selected on the slide, on the Playback tab, select Play in Background. ![]() In the file explorer, browse to the music file you want to use, and then select Insert. On the Insert tab, select Audio, and then Audio on My PC.
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