I was only aware of the AIR (Android) app through which I used to listen to Raagam station. Thanks to Harsha's tweet I got to know that All India Radio (AIR), Bengaluru also broadcast their radio stations on internet.
1. Listen to below stations on AIR Bangalore site
2. Via Playlist - Have created a playlist of all the above stations, which allows easy switching of stations while commuting / working, without having to visit web-browser. Import the playlist in iTunes or VLC & you are set to stream. Download the playlist file.