What sustains a bands popularity
We have all seen how a band will be the big thing for a little while and then fade away into obscurity. But then there are other bands that are able to remain true to their musical vision and they stay on top forever (i happen to think of metallica and tool for instance).
What is it that allows one band to be popular for years and years through album after album while others just pop up and are big and then just fade away? I ask this again with the mindset of a band maintaing their musicial vision and not just changing to suit the needs of the fickle public.