10,000 + LPs and about 1,200 CDs 650 DVDs
LPs and Cds divided into three separate groups: by Classical&Opera, then Jazz&newage&blues, then Rock&pop.
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Classical by composer A-Z, then each composer by solo, to small group to large, vocals last. If I have a bunch of Beethoven 5th, (for example) conductor name a-z order for the group, etc.
Jazz by primary artist alpha then within artist BY DATE RECORDED. Date give a better way of finding my way. I put the date on the edge of the LP, and CD.
Rock and pop same as Jazz, except if always a group, by that name, then also chronologically.
Very few artists cross these basic three groups.
For example:
Kiri Te Kinawa: opera and pop... (Lucky for me I do not own her pop music.)
Frank Sinatra could be with Jazz, but I definitely stick him in pop.
Bela Fleck, Jazz and bluegrass..Hmm I keep "Drive" with rock, the rest with Jazz.
I hate Classical collections.. and unless one item is outstanding to file it with that, I usually do not keep silly collections that are on one LP. Some Mercury 90000 label items or RCA 'shaded dog" stuff like this is all I will keep around. (Leroy Anderson, Boston Pops..)
Though I DO have a large bunch of Jazz various artist collections.. which are superb.
The Jazz LPs 2,500 are in the kitchen, the rock and pop 3,000 in the bedroom, and the classical LPs 6,000 in the living room... to distribute the 6,000 lbs of Lps carefully around the apt walls!