I buy CDs only. Don't really care about anything that isn't, or wasn't released on CD. If that rules out a whole bunch of music going forward, I really don't care that much. I'll cross that bridge when I'm bored with what I have. Everytime I try streaming, it leaves me utterly cold, bored and unfulfilled. It's like fast food.
There's simply so much music available on the secondary market, so incredibly cheaply on CD now, that I think I've picked up maybe 5000 or more discs in the last 10 years. Stuff I would not have spent $25 a disc on, but at 20c to $1, it's a baragin.
For classical, my father's enormous (many 1000s) vinyl collection goes back to some of the earliest recorded music right through well into the 90s with a huge crossover as he embraced compact disc in 1983. He's stopped buying any media as I do it for him. We have a joke that we could break a stylus everytime we play a record and probably never run out of NOS spares.