Ogg Vorbis is a fully Open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format for high quality (44.1-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bit rates from 16 to 350 kbps/channel. Ogg Vorbis is a popular free (as in free from patents) encoder, of a higher quality than Mp3, equal to m4a (aac) and surpasses WMA - most players support Ogg through a plug-in. Ogg supports full ID Tagging where track information (Artist etc) is imbedded within the music file.