I remembered having heard of people who use a special Game Boy software to create their own songs, using original Game Boy and cartridge sounds. Wikipedia spat out the (most popular's) software's name is
LittleSoundDJ.
Popular artists (to be exact: the only ones I found with their songs downloadable online) are Nullsleep, USK, Covox and Bit Shifter among others. They collaborate under the name of
8bitpeoples. I don't mean to advertise too much, but you should give
Nullsleep's (or any 8bitpeoples' artists!) songs a try.. I'm going to listen to 8bp-nullsleep-destination_tomorrow_[gb_version].mp3 until my head explodes.
Which brings up the question: Does anybody know, if one of these artists or any other chiptune musician can be seen in Germany/ Central Europe? Just imagine:
Dressing up like this, getting boozed up and finally losing mental health. AWESOME
More info:
Chiptune
Bitpop
Gamewave