For the record, wiki has Rush listed as Heavy Metal  ...while I agree on a technical level, they are not Heavy Metal
, they are a huge part of the longevity and breadth of that genre more that most spandex wearing longhairs
Background information
Also known as   Hadrian  [TIL alt rush band name]
Origin   Toronto, Ontario, Canada
Genres Progressive rock, hard rock, heavy metal[7]
Years active   1968–2018
Footnote
7: Rock and Roll: Its History and Stylistic Development (2003), p. 326, Joe Stuessy, Scott David Lipscomb
So take this up with Scott David Lipscomb on the Heavy Metal designation