Out of all the great music players out the Clementine is a personal favorite. On Linux we have quite a few options for a top notch music player and library manager, there is Banshee which is written with mono which is a cross-platform programming language that takes minimal code changes to target multiple platforms. While Banshee used to be the default on some systems it isn't the default on many nowadays as allot of the Linux distros have have decided to shy away from packaging the mono framework with their installation. Instead you'll most likely be Rythmbox if you using a GNOME based install or Amarok if your using a KDE base install. All of the music players with the exception of Rythmbox can be installed on Winows as well. If I wasn't using Clementine I'd definitely be using Amarok, there are a ton of cool features that aren't necessary but really nice, like the wikipedia article about the track that's playing for example.