[RadPig94]

How about "BAP"? They perform in Cologne slang only, which is sometimes almost impossible to follow, even for Germans, being of non - Cologne decendancy, like me.
But their music is frakkin' awesome! :

http://www.youtube.com/watch?v=I93l52-L5Ug

sounds like a certain American band i like... or was it british? :-? ha ha