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transistor transistor, bones brigade and kids like us are some of the more upbeat rockin hardcore, and minor threat and whiz kids are less rocky but more upbeat.
Edit: ah, I see, I had assumed that being "hardcore" it would have ANYTHING TO DO WITH HARDCORE but it doesn't, so nevermind, why do people do this?
It's rather apparent that nobody here knows what happy hardcore is aside from popololvic. I don't know any bands personally, but you know there is a website that could help you... http://www.happyhardcore.com/
Oh and Minwu, what in the hell makes you think Sonne is upbeat? The fact that the lyrics aren't positive or that it doesn't have an upbeat tone to the lyrics?