I really like odio. It sports a snazzy and beautifully engineered interface that’s simple to use, and elegant.
The software is missing some useful functionality such as media keys, the ability to record radio, better integration with popular Linux desktops, and the ability to import/export your library. The latter would be very useful for me, as I use lots of different machines.
odio makes streaming radio a real pleasure. While it’s not (currently) open source software, don’t let that dissuade you from giving it a whirl! Hopefully the developer will embrace the open source world so others can contribute to its development.