void setup()
{
  pinMode(3, OUTPUT);

  pinMode(4, INPUT);
  pinMode(5, INPUT);
  pinMode(6, INPUT);
  pinMode(7, INPUT);
  pinMode(8, INPUT);
  pinMode(9, INPUT);
  pinMode(12, INPUT);

  Serial.begin(9600);
}

void loop()
{
  if (digitalRead(4) == HIGH) {
    tone(3, 523, 200); // play tone 131 (B10 = 31609 Hz)
    Serial.println("Si");
  }
  else if (digitalRead(5) == HIGH) {
    tone(3, 440, 200); // play tone 129 (A10 = 28160 Hz)
    Serial.println("La");
  }
  else if (digitalRead(6) == HIGH) {
    tone(3, 392, 200); // play tone 127 (G10 = 25088 Hz)
    Serial.println("Sol");
  }
  else if (digitalRead(7) == HIGH) {
    tone(3, 349, 200); // play tone 125 (F10 = 22351 Hz)
    Serial.println("Fa");
  }
  else if (digitalRead(8) == HIGH) {
    tone(3, 329, 200); // play tone 124 (E10 = 21096 Hz)
    Serial.println("Mi");
  }
  else if (digitalRead(9) == HIGH) {
    tone(3, 294, 200); // play tone 122 (D10 = 18795 Hz)
    Serial.println("Re");
  }
  else if (digitalRead(12) == HIGH) {
    tone(3, 261, 200); // play tone 120 (C10 = 16744 Hz)
    Serial.println("Do");
  }
  else{
    noTone(3);
  }

}