Songbird is an open-source music player and organizer with which you can manage, play and discover music.
It's free, cross-platform and highly customizable thanks to a wide variety of plug-ins and can be improved and extended by the contribution of its user community. The first thing you'll notice about Songbird is its resemblance to the iTunes interface, which means that if you've ever used iTunes you won't have any problem in learning how to use Songbird.
Songbird automatically imports your music files from a selected folder, monitors that folder for future music additions, organizes your music in a handy, easily browsable catalog, is compatible with iTunes and Last.fm libraries, can be controlled from any other app thanks to global hotkeys and also supports Last.fm scrobbling. It also includes album art and a simple equalizer.
Songbird is such a complete tool that's hard to find negative sides to it. Plus there's an army of developers constantly working on improvements and new features. The only thing that's missing is support for podcasts. It should also be noted that with each new release of Songbird, your plugins may be broken by the new release.
Songbird is a complete, full-featured music player and organizer with support for plug-ins and an extensive user community.