I haven't personally listed to all of the sound quality heavy hitters, but these are highly regarded recordings in the community.
Classical: Royal Ballet, Living Stereo version (haven't heard). Absurdly expensive, so maybe look for an LP rip. But really, any classical music on any format will be recorded amazingly. Personally, the best sounding classical CD/LP I have is this
https://www.ebay.com/p/Holst-The-Pla...ution/55125179. Price is right.
Rock: Dark Side of the Moon, anything by Steely Dan, any 70's prog rock are highly regarded for their audio quality. Nirvana's Nevermind is mastered really well. Dire Straits' Brothers in Arms in a personal favorite. On a side note, here's an essential site to use when looking for the best masters.
http://dr.loudness-war.info/album/li...others+in+Arms. As you can see, the 1996 "remaster" and the ensuing "hi-res" DVD-Audio versions have worse dynamic range than the 1985 CD version, which you can buy for a couple of bucks.
On that note, don't fall for the "hi res" audio gimmick. Audio doesn't work like video, and humans can't hear beyond the quality of regular 16 bit/44.1khz CD audio, so all this "remastered at 24bit/192khz!" is nonsense. If a Super CD and regular CD were mastered the same, they'll sound the same. Reasons Super CDs are so coveted is because the best masters are often on the format, not because it's "higher resolution." I say this so you don't start spending a bunch of money buying those 24/192 versions from sites like HD Tracks. Look here. The HD Tracks Time Out version isn't any better than the 2009 CD release.
https://www.discogs.com/The-Dave-Bru...elease/2378181
Have to go, but will come back later with more recs.