NWOBHM

The new wave of British heavy metal was a nationwide musical movement that began in England in the mid-1970s and achieved international attention by the early 1980s. Editor Alan Lewis coined the term for an article by Geoff Barton in a May 1979 issue of the British music newspaper Sounds to describe the emergence of heavy metal bands in the mid-to-late 1970s, as punk rock declined amid the dominance of new wave music.

https://en.wikipedia.org/wiki/New%20wave%20of%20British%20heavy%20metal