You know, after playing some DKC2 today in order to help get my hopes back up, I realized something genius about it. The soundtrack. Not only is one the best soundtracks in gaming history, it fits so well.
In DKC1, you're on DK Island, a natural paradise. There's a lot of beautiful scenery with music that mostly tried for an ambient feeling.
In DKC2, you're on Crocodile Isle, enemy turf. It's dark and gloomy, with brambles, swampland and mist everywhere, and the music reflects that. It's much more ominous and foreboding. It just makes me appreciate the soundtrack more, and hope that we get a lot of it in SSB4.