My collection breaks down like so:
1950's: 5
1960's: 51
1970's: 113
1980's: 347
1990's: 707
2000's: 807
2010's: 318
So going by the numbers, the "best" was the 2000's apparently. That doesn't jive with me though. Despite it's paltry numbers in comparison, I'm a fan of the 80's stuff. That's when I discovered hard rock and heavy metal, so it's always gonna be considered the best of the bunch.
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I used to be with it, but then they changed what "it" was. Now what I'm with isn't it, and what's it seems weird and scary to me, and it'll happen to you, too.