Gosh, trust me Angie, I would SO LOVE LOVE LOVE that music too, but unfortunately that music is not legally available for DVD use without HUGE licensing fees, lengthy application and approval process per song (which can take months with no guarantees for song use at the end of the wait), outrageous royalty fees and of course an extreme amount of money. And it gets even more complicated...the music for DVD has different licensing requirements than that of TV use, radio use, download use, etc. So all of this work above has to be done slightly differently per media application....
Sadly, the pro's just don't outweigh the cons for us in these cases.