It's tricky with a band like ZZ Top. On the one hand, they're a bit silly
with their beards and their hand gestures--the gimmickry is their signature
element at this point. In 30-odd years of being a band, they don't appear to
have evolved in the slightest. On the other hand: they don't appear to have
evolved in the slightest in 30 years, because, frankly, it ain't broke.
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