Open your PowerPoint presentation
Go to the slide where you want the music to start
Click the Insert tab
Select Audio
Choose Audio on My PC or Record Audio
Browse and select the music file
Click Insert
Select the audio icon on the slide
Open the Playback tab
Choose Start Automatically or Start On Click
Adjust Volume if needed
Select Play Across Slides if you want the music to continue through multiple slides
Select Loop until Stopped if you want the music to repeat
Select Hide During Show if you want the audio icon hidden during the presentation
Save your presentation
Test the slideshow to confirm the music plays correctly