[Corvina]

There are some good german artists.

Die Fantastischen Vier (short Fanta 4) or Thomas D solo

MfG http://www.youtube.com/watch?v=mIM1c9ksr5k
Einfach sein http://www.youtube.com/watch?v=WdKBwHqiUC0
Krieger http://www.youtube.com/watch?v=JEn1YqfADuw
Thomas D - Vergiftet im Schlaf http://www.youtube.com/watch?v=Zl9L1XFCOVM

Fettes Brot

An Tagen wie diesen http://www.youtube.com/watch?v=xF8EsHLAj_Q
Schwule Mädchen http://www.youtube.com/watch?v=kawitbXsJIs

Die Ärzte

Lasse redn http://www.youtube.com/watch?v=Y7uyAl2rU7s
Unrockbar http://www.youtube.com/watch?v=36_JGMGL0tM

Die toten Hosen

Strom http://www.youtube.com/watch?v=0h8vl8oy7yA
Hier kommt Alex http://www.youtube.com/watch?v=5X-yqPhItr8

Beatsteaks

Jane became insane http://www.youtube.com/watch?v=aftgyc5N52Q

I recommend all of them. And there are some more. But I agree Germany is really bad with mainstream music.

Oh, short info, the first two are german Hip Hop, the last three german Rock/Punk (but Die Ärzte do have a big Pop influence).