The music has been improving every generation. I'm actually looking forward to the music just as much as graphics. BW/BW2 had many really good tracks (Route 10, my personal favorite). But I want a sound test in-game and the ability to choose which track I want to play in wi-fi/battle tower/subway etc. It starts to get stale listening to the same tune post-game.
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meganiultimate:
Replace it? Replacing it would be the worst thing to do, just imagine the number of illegal moveset/ability combinations that you have just created if there is cross-compatibility. If anything they should improve it like having a base power range between 60-70 instead of 30-70. Even though it makes more sense to base it off IVs, I would prefer they do it off something else like maybe EVs so at least we have the ability to change the type whenever we want.
EDIT: my bad sorry about the name