CoolPlayer is an MPEG Layer 1, 2, and 3 digital audio player for Windows. It features skins, a simple user interface, and a fully working playlist editor. The built in ID3 editor makes it simple to rename and modify files. CoolPlayer uses the Xaudio MPEG engine and is totally free.
Features:
GNU General Public License
Freeform Skins
Simple User Interface
Advanced Playlist editor
Internet streaming
ID3 Multitagger
File Renamer
Fast mp3->wav converter
MAD mpeg engine
OGG Vorbis support
Winamp input plugins support
Smallest executable programmed in blazing fast C
Continuous play
8 band precision equalizer
Lot's more...
Whats New in version:
Fixed potential buffer overflow when reading OGG tags
Fixed open file dialog not being modal
Fixed add directory dialog not being modal
Enabled XP visual style support
Fixed bitrate display showing parts of previous songs bitrate
WAV file bitrate is now shown
Improved dialogs
Keyboard shortcuts between player and playlist are now more integrated

The license of this software is Freeware, you can free download and free use this music&mp3 player software.