There are a lot of bands, it's hard to recommend some without knowing your musical taste. Additionally to those that have been mentioned:
Wir sind Helden - I like this band a lot, very interesting lyrics
Juli - if you're in a sad mood
Die Ärzte - good old fashioned German punk, they don't take anything seriously and make fun of everything
Anett Louisan - sometimes interesting lyrics, though not the kind of music I usually hear
I guess there's more. If you like 80's music, google for "Neue Deutsche Welle".