MIDI Library, For Communication With Musical Instruments
MidiDevice
Teensy MIDI USB foot controller for controlling Mobius Looper using Arduino - Use Arduino for Projects
Turn Your Arduino Uno Into an USB-HID-Mididevice : 3 Steps (with Pictures) - Instructables
Is there any reason why using a baud rate of 31250 on an Arduino MIDI project could cause problems? - Electrical Engineering Stack Exchange
How to Control Anything on Arduino Using MIDI - Parts Not Included
Building a Basic Midi Controller Part 1 - Easy 3 Pot (Potentiometer) Arduino Uno Effects Midi Controller (Serial-USB)... Quick,easy and Cheap! : 7 Steps (with Pictures) - Instructables
Cheap USB MIDI cable: some self assembly may be required – arvydas.co.uk
Pin en Arduino
DIY MIDI Over USB using Arduino Uno - Randumb page