Nearly any track on the Nik Kershaw CD "The Riddle".
(just try to find a copy) Peter Collns producer. (no, not Phil).
Don Quixote
The Riddle
Wide Boy
Know How
City of Angels (EU version)
The secret for me in a great mix is in the lower mids.
If those are well handled you are on your way to success with the master.
Also, let's not fool ourselves by spreading everything out in stereo unitil it's clean. That's OK in the phones, and in the sweet spot, but step back...ooops.
So here's the test? Pan all your tracks at 12 noon and give a listen.
Pass? If not, tweak, then re-pan. A great mix holds up under the "mono test".
OK, ...that's all you get for free!
Oh, and here's a stretch for all you kids... "For the Benefit of Mr. Kite". Sgt. Pepper. If any of you guys can paint a better picture with a mix using only four tracks you let me know... Thank you Sir George Martin for all those lessons of less is more...
Still studying that...
PS - I agree with all those in favor of SD's album "AJA"... also hard to beat.