Nightingale is a completely free and open source audio player and web browser based on the Songbird (which stops it’s linux support)source code.
As of now, Nightingale is still work-in-progress, although headway is being made since new developers joined the project. A preview release based on the Songbird 1.8.1 code tree was released on December 15, 2011.
To get it just go to http://getnightingale.com/, Download and Extract.
After you extract the tar.gz file, find the “nightingale” file and run. No need installation, it works out of the box.