By themselves, I rather liked the remixed versions of the older songs.. which were remixed from older songs previously. Hm. The Rondo only music remixes seemed to range from could be better to pretty good.
The music to me fits quite well with the remade stages it is associated with, the whole package fits together fine with me.
The only stage (overall) that didnt fit was the new stage, and the music (Red Dawn) along with it. The whole thing just sticks out like a sore thumb, especially the serpent boss.