Just saw the Quick Look and you are totally right. The new music is anemic and sounds completely wrong.
 
Here's my favorite original track. The last thirty seconds is awesome.
 
 

I don't like the wii version at all.
 
The "new" soundtrack sucks and i'm having audio problems too, everytime i go through a door the music stop.  What the hell Pixel.

Yeah, Balrog's music definately ties with Grasstown for the best one.
I think the new music is a bit too ambient n lacks punch. Like they should've re-done Grasstown with crazy ska trumpets.

Yep. Sounds like a pitter patter.

And I don't know why i play as a blonde girl who is not Curly in hard mode. 
Also, no Huzzah, this version sucks.

I like the theme song the best, the pc version that is.

I don't understand, the new music is alright at least half the time, even with sound issues.  I especially like the Scorching Back remix.
But those sound issues really are noticeable, and hurt the presentation... I hope they patch it around the same time as the European release.