void setup() {
  pinMode(9, OUTPUT);
  pinMode(2, INPUT);
  pinMode(3, INPUT);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
  pinMode(6, INPUT);
  pinMode(7, INPUT);
  pinMode(8, INPUT);
}

void loop() {
  if(digitalRead(2)==HIGH)
  {
    tone(9, 523.25, 1000);
  }
  if(digitalRead(3)==HIGH)
  {
    tone(9, 587.33, 1000);
  }
  if(digitalRead(4)==HIGH)
  {
    tone(9, 659.26, 1000);
  }
  if(digitalRead(5)==HIGH)
  {
    tone(9, 698.46, 1000);
  }
  if(digitalRead(6)==HIGH)
  {
    tone(9, 783.99, 1000);
  }
  if(digitalRead(7)==HIGH)
  {
    tone(9, 880, 1000);
  }
  if(digitalRead(8)==HIGH)
  {
    tone(9, 987.77, 1000);
  }
}