The problem with cutting it off at 100, is there's probably another good <insert arbitrary number here> (37?) classical songs that have transcended the genre. And there's no reason why people shouldn't be able to find those through your site. I'm sure you've got 10 songs you wished you could have fit in the 100.
I think transcending the genre really means:
"This song will be SOMEWHERE in every persons memory."
Whether or not that specifically means it had to have been used in popular media such as movie soundtracks, is questionable. There's just certain songs everybody has heard, and you can't quite place just where or how. I think those should all make your list.
For example, missing from your list:
Prokofiev's Romeo & Juliet - Dance of The Knights
http://www.youtube.com/watch?v=7YFCiMDovQc
I'd be hard pressed to find someone who hasn't heard this, somewhere. And yet your list is full with no room for it.
How about another 100?
Or a secondary, "most likely have heard" list?
Or perhaps expanding top 100 to top 150...
Oh, thanks for the cool site.
- z
