AAAAAHHHH~!!!!
I recommend battlecry by Nujabes. It's used as the opening song for Samurai Champloo. Definitely on of my faves!
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Also, have you watched Hypnosis Mic??? It was also fun and the songs were so interesting.. Here's a sample.
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If I just heard Battlecry somewhere, I wouldn't know it's from an anime! So hiphop
Right??? It doesn't sound like any typical anime songs. :D