Are there any parameters or limits? Rock only? released this decade, bootlegs, greatest hits... OK, so no greatest hits. Live albums? Abba? Disco?

I would think anything can be here except greatest hits.

It's any genre from Metal to Rock to Blues to Country to Jazz. Whatever floats your boat is acceptable. Even Soundtracks are included since there are composers that I love with regards to Movie Soundtracks. But as you mentioned, I think Greatest Hits packages don't qualify as it's not representative of what the band or artist had in mind when putting together their studio albums.

Time Frame: From the year of Adam and Eve.....all the way to present day can be included.