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

I have some Mahavishnu Orchestra. Will have to dig them out. Been awhile.

Was listening to Al Di Meola with a buddy of mine on CD. It's interesting, not my thing but tolerable. It is very well recorded as is a lot of jazz. I just don't listen to it very often. There was a deep synthesized note or sound that had the single strongest impact I've ever heard on a recording. We were listening quite loud and made my buddy and I both smile. 

I'll have to check Oregon, much of this is unfamiliar to me but I'll try anything once. :)

Pink Floyd DSOTM.  Original first pressing, Island Records.  Bought from Muffets Music, Providence. RI. I purchased it as an import, 10 days before it made its debut in the US.

I also use the Legacy Audio Music Sampler Volume 3 CD. I picked it up st 2017RMAF.   There are many amazing tracks on it.   I know you only wanted LP’s, but felt others may want to look for this.  

I have DSOTM on Island. Island is great and will always be better than the US copies. I also have a Japanese re-master version. The Island is still the best. 

I don't mind hearing about other sources, just that streaming is not what I have. CD's have their place and some are excellent, just not what I choose for "reference", since I am so heavily geared toward vinyl. CD's provide some great bass, some great impacts, voices can sound very natural, maybe not as "airy" as we can get but tubes may be lending a hand here too? But when it comes to the nitty gritty bits, especially percussion instruments other than drums, vinyl really shines. Organ chimes, bells, all the crazy weird little sounds. Vinyl or tape, pure analog just takes them to another level. Streaming might do it, I don't know. I have no experience with it. I just know what a reasonably good system can do with a nice LOMC and the gear that can support it. Vinyl jumps to life.

Yo Yo Ma Six Evolutions

you can here his fingers tapping the fretboard. total solo performance

Edmond De Lucas Conquerors of the Ages

The highest and lowest frequencies I have ever heard on any orchestra performance. Closest to 20-20K Hz I have ever heard.

Mahavishnu Orchestra was never well recorded, nor was Bitches Brew. But since I like all that so much I do use them to test the system. But MIles's trumpet still sounds about as it should on the recording. Inner Mounting Flame, especially a few tracks, are great to evaluate the dynamics.

Oregon's bass player plays custom acoustic bass. It sounds excellent and goes low.