RtMidi is a set of C++ classes (RtMidiIn, RtMidiOut and API-specific classes)
that provides a common API (Application Programming Interface) for realtime MIDI
input/output across Linux (ALSA, JACK), Macintosh OS X (CoreMIDI, JACK),
and Windows (Multimedia Library) operating systems.
RtMidi significantly simplifies the process of interacting with computer MIDI hardware and software.