I listen to a stream of a Los Angeles station called KUSC all the time. It’s a fantastic station (unless they’re doing a pledge drive, but don’t worry, they just did one) and it’s comforting that it’s the same hosts no matter where I travel.
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I used to listen to KUSC until I got annoyed with the commercials and interruptions, of which there are quite a few. Now I recommend Radio Swiss Classic (http://www.radioswissclassic.ch/), which is better in this respect; the music may be of slightly less variety and with less scommentary.
KUSC listener here too. I agree it's great station, plus it's available on my quite old Squeezebox devices. It's owned and operated by the University of Southern California
Asking to play it works across all major devices and platforms.