Maxim Said:
My favorite tunes remain the old ones remixed, such as that one stage music from Super Mario Bros. 3 and Bowser's theme from Super Mario 64. Oh yeah, I also like the Doomship music from Super Mario Bros. 3.
The old standby, a remix of the Super Mario Bros. "underground theme" is of course in there too. Nothing wrong with that. Though maybe a little too unsurprising...