There are 3 I have found whose sound quality stands out.
Bartok Radio Budapest, classical channel which broadcasts at 256 kbps mp3.
Big Blue Radio, 128 kbps AAC+ laid back classic rock channel. You can get the stream off of Shoutcast.com without having to register with their web site.
Great Radio, 160 kbps mp3. Classic rock that rocks. I can only find them at Shoutcast.com. They sound awfully good for 160 kbps mp3.
MOG! For audio quality, you want 320kbs at least. MOG is a sight that only streams in 320. It is a pay jukebox webservice and has a large but not exhaustive collection. The sound quality is amazing through an asynchronous DAC. Sounds much better than Pandora, a bit better than slacker, and much much better than Spotify.
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