ELP at their best IMO. Endless Enigma Pt 1, Fugue and Endless Enigma Pt 2.
This was my favorite album just barely ahead of Karn Evil ... I was definitely appreciated the Prog Rock genre even though I was really an avid Blues Rock fan.
Now, as for this particular mix on the link you provided, it was well done but the bass was very punchy.
I noticed it almost immediately as having more of a presence about it.
I asked the guy who posted it if it had been re-mixed from the original mix.
I'll let you know.
PS - Listening to Bolero now which I really like and spawned my interest in Classical music beyond Mozart and Beethoven.