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
Wish You Were Hear, Dark Side Of The Moon, Quadraphenia, Sargent Pepper's Lonley Hearts Club Band, Miles Davis's Kind Of Blue...I could go on forever.
Hi there!

Try Eva Cassidy's SONGBIRD album. Her voice will make you melt like butter!
getz/gilberto speaker's corner - everyone needs a copy of this album and this kills the SACD I have.
miles cookin/relaxin/steamin/new/workin 45rpm analogue prod - take your pick, they are all classics, too bad a couple are oop already.
Chet Atkin's Progresive Picking, Yes's Fragile (UK Plum label), Richard Thompson's This Old Kit Bag, Leinsdorf's Romeo and Julliet on Sheffield.