HELP! I cannot find the trailer song from Lust, Caution?

I am looking for the MUSIC ONLY. No lyrics. The music is from the opera Don Carlo - the song is Ella giammai m'amo. The music can be found on the trailer to Lust, Caution. I really just want to download this song but I will buy the CD. Someone please help - this is driving me crazy not being able to find it.

TAHNKS

HELP! I cannot find the trailer song from Lust, Caution?performing arts

http://www.youtube.com/watch?v=NH68kH2aj...