I have the song on iTunes, and when I attach a song file, it says “PowerPoint cannot insert a sound from the selected file. Verify that the path and file format are correct, and try again”. Any ideas on what I can do?
You should know that music purchased from iTunes store is DRM protected while Microsoft PowerPoint only accepts (DRM free) wma, mp3, wav, aiff, au, mid or midi as background music. Therefore, what you need to do is convert iTunes music m4p/m4a/aac to wma, mp3, wav. TuneClone Audio Converter works great for unlocking iTunes music and converting iTunes music to plain mp3, wma or wav.
Here is the full guide: http://www.tuneclone.com/convert-itunes10-m4p-to-mp3.php
Below is the screenshot of TuneClone Audio Converter (Windows version):
After you get the output music files, launch Microsoft PowerPoint and open your PPT. Then you will be able to insert the output music to your PPT presentation.