^took the words out of my mouth. i was gonna say, today doesnt have the powerhouse bands but we definetely have the diversity. Like, I love the music I listen to and its all current stuff, u just gotta know where to look. But, with all that said, its a pointless question because u have to specify... what kinda music are u talking about, what defines greatness(good bands, or amount of bands, or different styles, revolutions, etc...) and not to mention, its all a matter of personal taste. Some of the best bands out there, the ones with the most skill at all their instruments dont sound all that good or I guess marketable would be a better term. But on the other hand, some bands who really arent good at all can make really catchy sounding music that anyone could make and they get really famous for it *cough*greenday*cough*. But, if i had to choose one, id go with the 90's because of all the grunge/alternative/punk rock that went on in the 90's. But its safe to say that the boy band era(97-02 roughly) killed almost all rock thats from the 90's.
I ski at the crappiest hill ever...