I LOVE how variations of the ED song "Fubuki" play as the boss battle themes for the current event in Kancolle. I'm only up to E2 but can't wait to hear more! It makes those boss fights so much more epic!
Shame youtube seems to censor the audio from ANY gameplay video with that music track in it so can't share what it's like to those who aren't playing the game.
(P.S. If you're here you're interested in Kancolle which means you SHOULD!)