MT9 is a new file format being promoted in Korea as a ready replacement for the MP3 audio format.
MT9 files carry a .MT9 extension and are being marketed under the brand name Music 2.0.
The key to unlocking the MT9 format is the Music 2.0 player. It allows each track to be controlled separately, effectively allowing the end user to remix the sound tracks to his or her liking, eliminating some portions or simply highlighting others.
Background
Utilizing the concept put out by the EITA, Audizen developed the new format as a possible de facto standard to replace the aging MP3 format.
The format was presented at an MPEG meeting held in France in April of 2008. At that time the format was selected as a candidate for the new standard.
Another meeting will be held in June of 2008 in Germany by the group. It is anticipated that the format will get officially selected by the group to replace the MP3 standard.