Any music not copyrighted can be used.
To do this go to www.youtube.com
Enter the name of the artist or song which you wish to save.
On the right hand side of the screen you will be able to see the URL for the song, highlight that link and left click and select copy. If you cannot see this just right click on the page and select copy URL.
The click a new web search and enter the following video2mp3.net When the site opens select the by URL tab and then paste the link that you copied from you tube. Click ok and wait for the file to be uploaded.
You will then be prompted to either save the file or open it..
Now open powerpoint and start your new slide show. On the toolbar at the top of the screen click on the insert tab, and then select Movies and Sounds.
Now click on select from file.
Locate your MP3 which you previously saved from you tube. You will be asked how you want your music so that it either automatically starts or when you click it. It is up to you. You will then notice a horn on your slideshow - this is to show you the music. If it appears in the centre of your slide then click and hold it and move it to the bottom corner. This allows you to work on the rest of your presentation.
Once your presentation is complete then click on the slideshow tab and watch your slides and music come to live with your selected music.