Source: http://lifehacker.com/5635020/clementine
Amarok 2 has been out for awhile, but a lot of Linux users still prefer the less cluttered Amarok 1.4. Now, users of any operating system can get in on the action with the Amarok 1.4-inspired Clementine. it may not be as full-featured or unique as something like MediaMonkey or foobar2000, but more casual listeners unhappy with iTunes' lack of Last.fm or FLAC support will enjoy it.
It's a pretty basic playlist-based player, from which you can browse either a music library or just your hard disk. It supports a number of formats, including the oft-ignored Ogg Vorbis and FLAC, as well as a few different internet radio sources like Last.fm, SomaFM and Magnatune. It has support for notifications from both libnotify (on Linux) and Growl (on OS X) built-in, too. The only issue I had with it was that it didn't support the embedded cover art on any of my files—but its built-in cover art manager took care of that quickly by re-populating them all with info from Last.fm.
It's still in early stages, so it may become more feature-filled as time moves on, but for now it fits perfectly into the niche of people that don't need a superpowered music player but would like built-in support for some of the things that you need to install separately from something like iTunes (such as Last.fm, Growl, and FLAC).
Clementine is a free download for all platforms.