Thread: L4D Intro Music Stolen?

So I started a game of L4D and during the match loading screen, I heard the faint sounds of the intro music. I took my headphones off and still heard it. I thought I was going crazy. Then I walk into the bedroom and find my girlfriend starting up Moulin Rouge. I noticed a distinct similarity and decided to investigate:

Start @ 0:35
http://www.youtube.com/watch?v=bpq3uafN8Ls

Start @ 0:50
http://www.youtube.com/watch?v=3vAkMus8EVE

Not exactly but pretty damn similar I would say. Why do I feel like Vanilla Ice is doing consulting work for Valve...

http://www.youtube.com/watch?v=kk6NhjD3Dbg

ADD: I still feel that I heard this tone still and maybe its just the nature of the series of tones but it also sounds similar to this:

Start @ 0:30
http://www.youtube.com/watch?v=ej4pvJppAqY

Rappers sample crap from other songs constantly. Can't Touch This (MC Hammer) -> Superfreak (Rick James... BITCH!) for example.

As for the L4D music vs Moulin Rouge... meh, there's a few common notes and the tempo is similar.. but that's about where the similarity ends.