I know a lot of people are searching for the opera song that plays on the main menu, but that's not what I'm looking for.

Make no mistake, it's still an opera song though.

It's the one that plays during the rehearsal on the Curtains Down mission.
I want to get the version of the song from the game, complete with the click at the beginning and end of the track.

If someone could indulge me with this, it'd be really cool!

sorry its an old thread but i just thought i could still write. that song you are talking about is the original tosca i guess. so if you search it even on google or at least peer to peer programs, i think you'll be able to find it.