So, looking back at The TAC Top 50 Thread from 6 years ago, I don't think anything has changed. Since we're talking Metal, I'm going to remove bands like Dream Theater, Rush, MSG, Thin Lizzy, and Alice Cooper.
2. Helloween-Keeper Of The Seven Keys Pts 1&2
I can't separate these two either. They belong together. I think it was meant as a double album but they weren't allowed to release it that way, wasn't that right?
The Wikipedia entry for Pt. 1 says, "The band originally planned to release Keeper of the Seven Keys: Part I and Part II as a double album, but their record label refused, insisting that the albums be released separately. Much later in 2010, both albums were released together with bonus tracks." But that statement is unsourced, and I didn't dig any deeper than Wikipedia. Hard to imagine a relatively new band with a brand new singer would have reasonably expected to release a double album at that time. If they had done that, it would have blown my head clean off, and I might regard it as the best album ever!