The New Wave of British Heavy Metal (NWOBHM) occurred in the late 1970s after the fall of the original British heavy metal bands like Led Zeppelin and Black Sabbath. The progressive sounds of metal were sped up and turned into blistering power chords.
... 65 years of age or older. The median age is 40 years. For every 100 females there are 102.1 males. For every 100 females age 18 and over, there are 100.8 males.
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