#define NOTE_G3  196
#define NOTE_E4  330
//...

int buzzer_pin = 12;

void setup() {
  pinMode(buzzer_pin, OUTPUT);
}

// 0 - 20000
// 1/8, 1/16 -> 1000/8=125

void loop() {
  tone(buzzer_pin, 1319, 125);
  delay(125);
  tone(buzzer_pin, 540, 125);
  delay(125);
  noTone(buzzer_pin);
  delay(1000);
}