What are your go to LP's for evaluating new gear or new tubes?

I had a whole collection of Mannheim Steamroller Christmas LP's that I never listened to until this past holiday season. They are easily my favorites now. Not a huge Christmas music fan but some is certainly enjoyable. I always listened to TSO over the Christmas season and often just the CD's. I bought them on vinyl but it is nowhere near as engaging as the MS vinyl at least that I recall. So many system changes lately, it's hard to keep track. The 30/40 MS double album is also one of my new favorites. Had it for years and never heard it. Funny how that goes. So much vinyl, so little time. 

Check out the October Project album that I listed. It’s amazing in my opinion. Beautiful voices and all different types of instrumentation.

Do you have Qobuz? I know it's on there. 

I don't stream anything..........yet. Never say never but I am very content listening to vinyl and cd's, mostly vinyl. For serious listening, it is vinyl 90% of the time. So...........I'm really looking for what pieces of vinyl stand out as stellar performers in your collection, such that you use them for reference. Jazz is something I never listen to so any jazz albums will mean nothing to me. No intent to offend, I just won't know it. Thanks for any input and to those who already replied.

Steely Dan's Aja and Pink Floyd's Dark Side of the Moon

The Reiner/CSO Scheherazade, Joni Mitchell's Court and Spark, Ry Cooder's Paris, Texas