Strong One: Is unfortunately rather notably prone to being used in terribly ironic ways (Negative Man is one of the weakest enemies in the entire game, the Barrier Trio's power comes from intelligence/sorcery rather than actual brute force, the Heftyheads and Hippo Launchers really aren't that strong when compared to how powerful your party members have hopefully become at their points in the game, and the Masked Man's ludicrously high attack power is basically his way of hiding how pitifully weak he is on the inside), but is a song that absolutely embodies hopelessness nevertheless
Master Porky's Theme: One of the greatest final boss themes of all time, and also a perfect send-off for the game's "Porky" leitmotif
Battle Against The Masked Man: Yet another one of the greatest final boss themes of all time, and also one of the most disturbing
And El Mariachi: Don Flamenco as portrayed by Punch-Out Wii, is that you?
Smashing Song Of Praise: Don't even get me started on those mood shifts of its
Well, it might not be the best soundtrack I've ever heard, (I still think the SNES Donkey Kong Country soundtracks are the absolute best), but Shake It! definitely has the best OST of any Wario game. (With that of Wario Land 4 being second IMO.)