Thank you for using the Jiskha Homework Help Forum. Here are some sites for you:
1. (sound): (Broken Link Removed)
2. (part II of #1): http://office.microsoft.com/en-us/powerpoint/HA010348231033.aspx
3. (music): http://www.presentationhelper.co.uk/powerpoint_music.htm
4. (part II of #3): http://www.presentationhelper.co.uk/powerpoint_sound_clips.htm
6. (music/sound/narration): http://presentationsoft.about.com/od/nextstepsinpowerpoint/ss/sound.htm
8. (2002): http://www.indezine.com/products/powerpoint/ppsoundacross.html
BTW, do you have a sound card?