Oh, and I just noticed this: I have two versions of the same song in my winamp playlist, in two different languages ("Fidati di me" / "Fiate de mi" by Laura Pausini, in Italian and Spanish). I can recognize which version is which from the first five seconds of the track. The singer hums at the beginning, and she does it in a slightly different tempo in each version. I did this subconsciously, until just now, when I caught myself doing it and decided to check what was it that it was different and allowed me to guess the version.
I'm such a music freak. ^^;;;