Play music across multiple slides in your slide show
https://support.microsoft.com/en-us/office/play-music-across-multiple-slides-in-your-slide-show-b01ded6a-28c8-473a-971a-6dfa92cc9367
WEBIf your slide show is longer than one song, you can add more songs. However, if you find that you're having trouble synchronizing the music with the slide show, you can use a third-party audio editing tool, such as Audacity®, to string the songs together into one file so they play continuously throughout the slide show.
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