Save the PPT and music into a single folder
From the folder you just created: Open PowerPoint and relink your music
Close PowerPoint
Right click on folder. Click Send to > Compressed (Zipped) folder
Attach this folder to your email.
For more info go to: Sounds/Movies don't play, images disappear or links
break when I move or email a presentation
http://www.rdpslides.com/pptfaq/FAQ00155.htm
Does this work?