The MIDI Manufacturers Association (MMA) is an organization where companies work together to create the standards that assure compatibility among MIDI products. The MMA is a U.S. organization established in 1985 by the original developers of the MIDI 1.0 Specification in 1983. Since 1985 the MMA has produced 11 new specifications and adopted 38 sets of enhancements to MIDI.
References
MIDI Manufacturers Association Wikipedia(Text) CC BY-SA