int speakerPin = 3;

int length = 70;
​
String notes[] = {"G4","G4", "G4", "D#4/Eb4", "A#4/Bb4", "G4", "D#4/Eb4","A#4/Bb4", "G4", "D5", "D5", "D5", "D#5/Eb5", "A#4/Bb4", "F#4/Gb4",    "D#4/Eb4","A#4/Bb4", "G4", "G5","G4","G4","G5","F#5/Gb5", "F5","E5","D#5/Eb5","E5", "rest", "G4", "rest","C#5/Db5","C5","B4","A#4/Bb4","A4","A#4/Bb4", "rest", "D#4/Eb4", "rest", "F#4/Gb4", "D#4/Eb4","A#4/Bb4", "G4" ,"D#4/Eb4","A#4/Bb4", "G4"};
int beats[] = { 8, 8, 8, 6, 2, 8, 6 , 2 ,16 , 8, 8, 8, 6, 2, 8, 6, 2, 16,8,6,2,8,6,2,2, 2, 2,6,2,2,8,6,2,2,2,2,6,2,2,9,6,2,8,6,2,16  };
int tempo = 50;

void playTone(int tone, int duration) {
  for (long i = 0; i < duration * 1000L; i += tone * 2) {
    digitalWrite(speakerPin, HIGH);
    delayMicroseconds(tone);
    digitalWrite(speakerPin, LOW);
    delayMicroseconds(tone);      
  }
}

void playNote(String note, int duration) {
String noteNames[] = { "D#4/Eb4", "E4", "F4", "F#4/Gb4", "G4", "G#4/Ab4", "A4", "A#4/Bb4", "B4", "C5", "C#5/Db5", "D5", "D#5/Eb5", "E5", "F5", "F#5/Gb5", "G5", "G#5/Ab5", "A5", "A#5/Bb5", "B5", "C6", "C#6/Db6", "D6", "D#6/Eb6", "E6", "F6", "F#6/Gb6", "G6" };
int tones[] = { 1607, 1516, 1431, 1351, 1275, 1203, 1136, 1072, 1012, 955, 901, 851, 803, 758, 715, 675, 637, 601, 568, 536, 506, 477, 450, 425, 401, 379, 357, 337, 318 };
  for (int i = 0; i < 29; i++) {
    if (noteNames[i] == note) {
      playTone(tones[i], duration);
    }
  }
}
 
void setup() {
  pinMode(speakerPin, OUTPUT);
}
 
void loop() {
  for (int i = 0; i < length; i++) {
    if (notes[i] == "rest") {
      delay(beats[i] * tempo);
    } else {
      playNote(notes[i], beats[i] * tempo);      
    }
    delay(tempo / 2);
  }
}