SomaFM has been streaming audio live on the Internet since 1995. I discovered them around 1997-1999 and have been listening off and on since then.
They have several channels, but I tend to listen to either Secret Agent or Groove Salad. They also have Techno, Rock, Lounge and several other styles available. They stream each station at several quality levels, so even if you have a lower bandwidth connection you can enjoy their broadcast.
They really, really need help. If you’ve listened to SomaFM in the past, please consider donating to them. If you’ve never listened to them, please give them a try. If you find yourself listening to them more and more like I did, please support them!