awareness....
is HUGE
for drummers.
even when you watch vids of Bonham playing,
he always FINESSED the cymbals even as he appeared to be crushing them.
he was extremely aware of his overall mix,
the other side of the 'classic rock' coin would be alex van halen, who just bashes the cymbals,
that's why all of their songs are just a non stop wash of cymbals..
but that kind of works for van halen,
so it's all relevant.
but when you can hear that it is wrong, it is wrong.
great thing is, it's so easy to fix (at the drummer)
and, the end result is awesomeness.