Yac

Quite a few actually, though in depends on what genre you like. Plus it could be problematic with hip hop as most of it is in Polish.

In no particular order, off the top of my head:
Grunge-like
Hey - Misie (teddy bears)


A bit heavier
Illusion - Nóż (Knife)


Sweet Noise - Bruk (Cobblestones)


Hip hop
Kaliber 44 - Masz albo myślisz o nich (you have it or you're thinking of it)


52 Dębiec - Pies (dog)


Punk/Oi
The Analogs - Dzieciaki atakujące policję (Kids attacking police)


Blues
Dżem - Whiskey


60's rock
Breakout - Gdybyś kochał, hej (Had you loved, hey)



Folk/Rock (or something .. this band had quite a few hits in many genres)
Republika - Czeczenio (warning: the video gets rather graphic at one point, not that you can't hande it)


DnB (or whatever you want to call it)
Electric Rudeboyz - Nie ma lekko (it gets tough)


Just a small sample of what I consider some of the best, notice most of this stuff is from the 90ties or older - new music is mostly pure crap.