Most time I play iTunes on Mac or still using my iPod. It's very convenient. I have about 1000 CDs and maybe 200 vinyls, but I have to admit that I don't listen to them anymore on a CD player or using a record player. I still could do it anytime I want, but either I work on my Mac or I am on travel. For both MP3 is the best solution for myself. I prefer listening to my library instead of streaming. If I buy new music it's usually on CD. Although I don't buy much new stuff.