I've been looking for a certain song for 2-3 years now, not 24h/day, but from time to time, I look for it, never did found it. I know for certain it was a Hip-Hop clip or Rap clip many years ago, with a woman singing opera in the background. Think it was a Armageddon(movie) based videoclip. I did only find a small piece of it, of what the opera singer sang in the clip. Clik on the link and listen from 04:48. YouTube - What a Cartoon 2 (http://www.youtube.com/watch?v=xN35przh8pw)

Alexander Borodin - Polovtsian Dance No 17 (Stranger In Paradise)
The answer was in the comments of the video ;)

I found an mp3 of it. What's the easiest way to get it to you?

Ah, I just uploaded it to a uploading site...
Polovtsian Dance No 17.mp3 (http://www.2shared.com/file/4988696/31404b1c/Polovtsian_Dance_No_17.html)

Just click the "Click Here" link next to Save file to your PC

And YES! That is the exact song I've been looking for years! How can I thank you! Can't believe I've actually found it :D! Thank you so much for all the trouble!

Glad to be of service!