In my opinion, Foobar2000 is the greatest free music player out there. It combines the ease of use, its power to use very little memory, and its many options into one package making it the best. Foobar2000 has the power to play audio formats like: MP3, MP4, AAC, CD Audio, WMA, Vorbis, FLAC, WavPack, WAV, AIFF, Musepack, Speex, AU, SND. It has gapless playback, Unicode support, an easily customizable user interface, advanced tagging capabilities, support for ripping cds and even transcoding audio formats into other formats, full replay gain support, customizable keyboard shortcuts, and best of all an open component architecture so any third party developer can edit the player itself. The features just listed are a small part of what makes Foobar2000 great, I believe that the best thing about this player is it uses very little of a pc's memory to power it unlike some others. Overall i would recommend Foobar2000 to anyone looking for a small, fast, user friendly music player for free.
Link to site-http://www.foobar2000.org/