gender bias in the bands

Is it just me or are bands always made up of men? Rock bands, I mean (although marching bands have similar stats, it seems). Woman singing, men back her up. Man sings, men back HIM up. Seriously, when is the last time you saw a professional group with a girl drummer? What is up with that? At least girls have gotten over the guitar glass ceiling, and they often play piano as well. But usually, they do that if they're the ones singing. They're not so likely to do it as backup. What do we need to do to change this? Enroll your daughter in music lessons today... drums, guitar, bass, piano, doesn't matter. We need musically literate women to do something other than sing.