Oh, so we're going all the way then? Alright.
DKC2 has an incredible soundtrack, but because I can't bring myself to love the game as much as most other people it's just hard for me to hold the soundtrack in as high regard as it deserves. Either way, my favorite one is Lockjaw's Saga for sure.
...though there are loads of awesome ones. Hot-Head Bop, Forest Interlude, Mining Melancholy, Stickerbrush Symphony, Flight of the Zinger, even the world map theme. It's all really great.