Arduino sketch for (really) minimalist MIDI controller

oneKeyMidiController.ino

//One Key MIDI Piano
//This is a test for Serial MIDI output through Arduino USB port
//Used Hairless Midi as Serial->MIDI bridge and one push button on pin 53 of Arduino Mega 2560
//Connect GND|<------{|Button|}------>| Pin 53
//Plays a G#2 which is mapped to cowbell on the drums of GarageBand
#include <MIDI.h>
#include <midi_Defs.h>
#include <midi_Message.h>
#include <midi_Namespace.h>
#include <midi_Settings.h>

const int pushButton = 53;

//Defining the BaudRate used by Hairless MIDI bridge
//To use with Arduino default USB 'modem' mode
struct MySettings : midi::DefaultSettings
{
  static const long BaudRate = 115200;
};

//midi::MidiInterface<HardwareSerial,midi::DefaultSettings> myMidi(Serial);
//midi::MidiInterface<Type> Name((Type&)SerialPort)
//MIDI_CREATE_INSTANCE(HardwareSerial, Serial, MIDI);
//MIDI_CREATE_DEFAULT_INSTANCE();
MIDI_CREATE_CUSTOM_INSTANCE(HardwareSerial, Serial, MIDI, MySettings);

void setup() {
  //Set the button pin, using internal pullup resistor
  pinMode(pushButton, INPUT_PULLUP);
  MIDI.begin();
}

void loop() {
  if (!digitalRead(pushButton) ) {
    //Button clicked
    MIDI.sendNoteOn(56,120,1);
    while(!digitalRead(pushButton)) {
        //Button is being held
    }
    //Button released
    MIDI.sendNoteOff(56,0,1);
  }
  delay(100);
}