I only have 3,000 LPs so my task is MUCH easier than Elizabeth's. While jazz is my overall favorite category, I must choose for variety. And that means samplings from several styles:
*Miles -- Kind of Blue (this would be #1 no matter how many I got to choose)
*Brubeck Quartet -- Carnegie Hall Concert (includes hits from Time Out plus more variety)
*NGDB -- Will The Circle Be Unbroken
*Beethoven Nine Symphonies -- von Karajan/BPO (1962 recording, hey, the records came in one album box!)
*Beatles -- Sgt. Pepper (or Rubber Soul or Revolver)
Now, where are Monk, and Mingus, and Bach, and Coltrane, and Zappa, and Talking Heads, and Mozart, and Simon, and KD Lang, and Satchmo, and Dolly, and, and, and?