The late 1970s–early 1980s period in the United Kingdom introduced a movement of young musicians, generally identified as the new wave of British heavy metal (often abbreviated as NWOBHM). The movement spawned more than a thousand hard rock and heavy metal bands from all over the UK, which were more or less forcibly identified as heavy metal acts. Most of those bands did not survive past the mid-1980s and disbanded, but many reformed in the 2000s.