Building a 100 album vinyl collection 3 must have albums are?

I’m ashamed I didn’t remember the 1st Moody Blues album, when they were a Piano Based Blues Band with Denny Laine singing. Many are aware of the Justin Hayward Era, but this is how they came to fame.

Moody Blues, Go Now,

Go Now, song, showing USA version of LP Sleeve

https://www.youtube.com/watch?v=SN2fOgfFnDo

Whole Album on youtube, different sleeve image

https://www.youtube.com/watch?v=IcgY1kWDzqk&list=PLZ-KH7o-aD2hFPcuUog_mStKaFD9ud_3-&index=1

I’m lucky to have found 2 copies on R2R tape at great prices years ago

https://www.ebay.com/itm/265963964309?hash=item3decb00795:g:4YAAAOSwgQdjRb49&amdata=enc%3AAQAIAAAA0JwyPB0JheFvv7e%2BzfCsFUwVZ5IEHCxKPy%2Bve8NQy0bjZAViKirL9NTh5mo3NpITtVaSCsLE11n0s91BRoKVRX54o3qp5MYSpaI4gsOtMLQf2l8nzLOlPp%2BzjNbmsGoDWM4OHH9l4B8%2Fl%2Bz4yHiJ%2FDGgxW4WsOhxqeIDVzEuCLYF60SyFnyMai1%2FfUTQbuEjuMsVARAKuk6GV1p2T%2FXF1oSe4x0GW7oDIc6bj4SriOpYePiJ0M%2BkhPYKE7h0M1wC7VAakQw3RrQlQYjBNNqWUCw%3D%7Ctkp%3ABk9SR66Axf25Yg

The Piano benefits most from the Tape Format.

btw, I'll Go Crazy was written by James Brown, here, 1960, with the Famous Flames

https://www.youtube.com/watch?v=Twa3WQk2fgk

@tony1954, 

You should also mention to the OP that an original, genuine pressing of Tool's "Aenima" will run at least $1000.  There are many, many bootleged versions, but very few genuine articles.  

the Shure test records (count as one)

the Denon test record

etc., etc.,

@palasr 

Not sure how relevant that is, as the same could be said for an "original, genuine pressing" of Kind of Blue, Pet Sounds, Allman Bros. at the Fillmore East, Blue Train, etc. As there was no reference to cost in the question and there are always avenues for finding good bargains on anything if one is diligent.