Make sure your video is in a format compatible with PPT  (avi or mpg,  mpeg).
Then go to Insert > Movie and Sounds > Movie from File (browse to where
you've saved your avi or mpg).

To add the music use
Insert > movies and sounds > music from file

You might want to read through the sounds section here if you want the music
to play for the whole presentation, loop or be embedded etc

-- http://www.technologytrish.co.uk/ppttipshome.html

Did that answer the question / help?
_____________________________
John Wilson
Microsoft Certified Office Specialist