How to add background music only in the middle of the ppt (for example: a poem will only play automatically in slides 8, 9, and 10, and will automatically stop when it is finished)

ppt2007: Click on Slide 7 - Insert - Sound - Sound in File - Select the music file - Then click "Automatic" or "On Click" - Click Animation - —Custom animation-left click on the drop-down button next to it-Effect Options-Select the effect in the Play Sound dialog box-Stop playing and select Stop after the ninth shot-OK

ppt2003: It’s similar, you can just refer to it.