Try audio hijack pro?
Hi there,
I have used Audio Hijack Pro to sometimes sample music from DVD's, try Googling it, I think it's Rogue Amoeba that make it (I think). Anyway it lets you capture sound from most things running including DVD player, so you may find you can just put the dvd in and record the title music into it. It can record in MP3 or AIFF and there are quite a few options. You will likely get it in trial mode but I think it puts a restriction on how long you can record for. Something like ten minutes, but this is just a guess as I haven't used it in quite a while. I have used it to capture some sounds though and found it quite useful. After capturing in MP3 you can just import it into iTunes.
Been a while since I used it but give it a go and see.
Hope this helps
Cheers.