int buzzerPin = 4;

void setup(){

pinMode(buzzerPin, OUTPUT);

}

void loop(){ playDoremi(); delay(1000); }

void playDoremi(){

  #define NOTE_C4 262
  #define NOTE_D4 294
  #define NOTE_E4 329
  #define NOTE_F4 349
  #define NOTE_G4 392
  #define NOTE_A4 440
  #define NOTE_B4 493
  #define NOTE_C5 523

  tone(buzzerPin, NOTE_C4, 700);
  delay(300);
  tone(buzzerPin, NOTE_D4, 700);
  delay(300);
  tone(buzzerPin, NOTE_E4, 700);
  delay(300);
  tone(buzzerPin, NOTE_F4, 700);
  delay(300);
  tone(buzzerPin, NOTE_G4, 700);
  delay(300);
  tone(buzzerPin, NOTE_A4, 700);
  delay(300);
  tone(buzzerPin, NOTE_B4, 700);
  delay(300);
  tone(buzzerPin, NOTE_C5, 700);
  delay(300);
  noTone(buzzerPin);
}