What are the "Must have" LP's?


I have recently re-discovered the LP. I listen to Jazz, blues, classical, and some rock. I was curious as to what my fellow audiophiles here on audiogon believe to be the albums that you simply MUST HAVE. As a sub-question, What LP's do you use to show off your system? Since I am just getting started, I have no real opinions yet, but as I become more and more familiar I will post my findings. Thanks.
limabean683
MCA Heavy Vinyl / Dave Mason : Alone Together
MCA Heavy Vinyl / The Who : Who's Next
MFSL The Eagles / Hotel California
Blue Note 180 gram Pressing / Cannonball Adderley : Something Else
Sundazed 180 gram pressing / Love: Revisted(buy on line at Sundazed Records. Cheaper.
Yasef Latef : Lost in Sound
Oringinal Pressing / John Cougar Mellencamp : American Fool
All these sound so good on my Turntable.
I've heard and or own many of the above recommendations and they are fine. By far and away, the most astounding lp sonics I've heard is John Abercrombies "Current Events" ECM1311. I've got a mint promo copy from a radio dj's collection, don't know if that's a factor. Excellent music & superb sound in every parameter you can name. I've got lp's from Sheffield Labs, various labels Direct to Discs, Mobile Fidelity, 45 rpm's, this one is better than all of them. I generally find ECM lp's to have reliably excellent sound
REM's first album, "Murmur" on Mobile Fildelity's 200 gram vinyl. Timeless pop music on a sonically beautiful platter.