Yeah, and then they all cut their hair and grew goatees.
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Funny, that.
Besides, Metallica looked like that (your pic above) before the hair metal craze, too ... they didn't change for that (a good thing)--not until something heavy came along that was more popular. Then come the stylists ...
My post wasn't really intended to be a pro-Metallica post...I haven't listened much to them since 1989. Just pointing out that what Nirvana was doing image-wise wasn't all that new, revolutionary, or counter-cultural.