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Prog lacks a proper definition. The confusion lies in the title of progressive meaning it has to change. We all know what traditional Jazz or Reggae is. Funk, Soul, etc. Prog in a traditional sense did have it's formula grounded in the late 60's through the mid 70's. All the classic prog bands that people are still talking about had jazzy drums and a strong keyboard palate.
The modern prog is metal based, not jazz based. Complex metal is seen as prog, but it wouldn't have been seen as prog in the traditional sense put aside the 70's bands. It would be compared more to bands like UFO, Scorpions, Judas Priest or Sabbath. Metallica came along with complex metal that wowed people, but was a far cry from traditional prog.
Metallica is complex...
Nobody's calling them prog either but that's a different story.
Frownie is being kind. Before you discuss prog I would suggest learning what it is. Maybe there's commonality between prog and metal in the 21st century but in prog's 1960's roots metal had yet to begin, even the hard rock bands of the day like Sabbath weren't metal yet, that really didn't start until the '80's
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