There’s no doubt that music can be a great addition to a presentation. But where do you get music you can legally use? Well there are a couple of sites you should try. Both have tons of songs available for download with liberal usage licenses for non-commercial use. Some of the music is even free for use in your commercial work.
For your presentations, you’ll find that the majority of these artists only ask for attribution (just a credit at the end of your presentation will do). You can find every style from rockin fast to slow and dramatic. I suggest searching for instrumentals or for sound tracks as a start.
Try these great sites: dig.ccmixter and Jamendo. The downloads are fast and the quality is very good.
Take a look at this little video I edited for our local (non-profit) film festival. The music conveys the playfulness of the event. So if you want to set a mood with your presentation, take a listen and grab a free download!