void setup() {
  // put your setup code here, to run once:
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
pinMode(12, OUTPUT);
pinMode(13, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(10, HIGH);
tone(10, 262 , 500);
delay(500);
digitalWrite(10, LOW);
tone(10, 262 , 500);
delay(500);
digitalWrite(11, HIGH);
tone(11, 349 , 500);
delay(500);
digitalWrite(11, LOW);
tone(11, 349 , 500);
delay(500);
digitalWrite(12, HIGH);
tone(12, 440 , 500);
delay(500);
digitalWrite(12, LOW);
tone(12, 440 , 500);
delay(500);
digitalWrite(13, HIGH);
tone(13, 523 , 500);
delay(500);
digitalWrite(13, LOW);
tone(13, 523 , 500);
delay(500);
}