The Garritan General MIDI collection is a library for those who like to work in General MIDI. General MIDI is a specification that's almost universally accepted that provides for a industry-standard soundest to make music with. General MIDI follows a standard that almost universally accepted that provides for a industry-standard soundest to make music with. General MIDI follows a standard that assigns 128 instrument sounds that are assigned to specific numbers. The idea behind General MIDI was to allow files to be used among different synthesizers, sound modules and devices with predictable results.