Most recordings you own by a single artist, group, or composer

warren Zevon Chet Baker,Sonny Rollins

Concertgebouw Orchestra (their RCO Live series is great,) J.S. Bach, Stravinsky, and then Dead Can Dance. 

Mitchagain, thanks for the additional Richard Thompson recommendations.

And thanks to you all you who along with identifying them, have listed approximately how many albums you have of your favorite artists. I’m sure many of us had no idea there were so many releases by some artists, including bootlegs. And you’ve got to appreciate how assiduously some of you must have sought them out to acquire such terrific collections. It’s interesting too the variety of musical tastes reflected by the serious collectors among you.

Mike

Julie London - Complete collection.  All LPs in both mono and stereo.

I don't collect, I buy (bought) to listen and pass on to my sons, so what's exiting the brain .... nearly all albums of

Dylan, Stones, Beatles, Ani DiFranco, Oscar Peterson, Terrance Blanchard, Cassandra Wilson, Van Morrison, Billy Joel, Kate Wolf, Eva Cassady, James Taylor, Patty Griffin, Nora Jones, Nancy Wilson,  omg, 

Well, then I got into Reel to Reel, (acquired content limited by the end of production 1980's), stopped buying CD's, then back to/upgraded Turntable, buying some new but mostly cleaning my existing LP stock, so I don't own or even know about the current output of favorite artists. Minor streaming, but to find new artists primarily using Pandora 'stations' feature.