What game do you think wove music most effectively into its gameplay, and why?

[Kresnik]

the_dengle said:

Music? Gameplay? Seriously, it's ridiculous to suggest anything other than a rhythm game.

I think maybe you actually meant to ask which game wove music most effectively into its narrative, or perhaps experience.

I thought about changing the thread title after we got a slew of rhythm game replies on the first page.  But you know, even with the slightly-ambiguous and probably-a-little-wrong title, we still seem to be getting tonnes of different games brought up, with everyone interpreting it a little different.  There have been some awesome suggestions so far, I've thought, so why change it now :)