Legal Use of Music Downloads?

I'm thinking of starting a business that creates video slide show DVDs from my customer's personal photos. Music would be added to the slide show.

Is it legal to use music tracks on the DVD, legally purchased, on the customer's behalf (and for the customers personal use only), from a source like Dell Music Match or other legal download site? If so, what statute protects me?

Stipulations:
1. I would Not retain a copy of the track, digital or analog, in any way, shape, or form after the DVD has been produced.
2. I would pay for and re-download the track again each time a new customer requested the same track.
3. Only one copy of the DVD would be produced and for only one customer.
4. I would probably try to print a confirmation of the download purchase to prove that I paid for the music.
5. I would argue that my fee would be for the service of producing the DVD from their photos, not for the music.

If you can show a purchase for each customer you will have no copyright problem.

Originally Posted by Unregistered If you can show a purchase for each customer you will have no copyright problem.

This to me seems to be a topic upon which even the best legal scholars might disagree and I want to do things 100% legitimately.

No offense, but since I don't know your qualifications, are you certain?