Download the New MIDI 2.0 Specifications for Free
Now available from The MIDI Association, the complete MIDI 2.0 Specifications are ready for you to download and read for free.
You do have to be a MIDI Association member, but membership is also free, and anyone who uses MIDI can join. All you have to do is sign up here and download the documents here. Documents include the MIDI Specification 2.0 Overview, MIDI-CI Specification, and three other files in PDF format.
Even if you’re not a member, you can read an informative description of the specifications here.