Read your comment, but the page won't let me "approve" it. Never seen Motorhead live, but they are definitely legends. They actually predate that first wave of bands shown in the thread. Rosenda has seen them a bunch of times.
If you want to Cliff Note some of that metal info, check out a movie called Get Thrashed on netflix. It's excellent. Also, beware of negative outlooks. I love metal, but there is a lot of negativity within the genre.
Update on the progression discussion. Was on a metal review site and many people were lamenting the fact that Lemmy was 65 and the next 10 to 15 years were going to be catastrophic for metal as veteran bands "aged out". I laughed.