If the song is a wav file (or you know how to add a wav header if its an mp3)
then another way is to insert it as a transition sound on the slide in the
middle
Slide show > slide transition
Scroll down in the "sound" box to "other sound"
Navigate to your sound file
Advantage of this is it will be embedded and it will play across slides
without adjusting settings
To add a wav header to mp3 files
Download Cdex :
http://sourceforge.net/projects/cdexos
Select the mp3
Convert > add a riff wav header to mp2/3
OK
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Did that answer the question / help?
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John Wilson
Microsoft Certified Office Specialist