void setup() {
 pinMode(13, INPUT); 
digitalWrite(13, HIGH);
pinMode(12, INPUT);
digitalWrite(12, HIGH);
 pinMode(11, INPUT); 
digitalWrite(11, HIGH);
pinMode(10, INPUT);
digitalWrite(10, HIGH);
}
void loop() {
while(digitalRead(13) == LOW)
{
  tone(9,262);
}
while(digitalRead(12) == LOW)
{
tone(9,294);
}
while(digitalRead(11) == LOW)
{
  tone(9,330);
}
while(digitalRead(10) == LOW)
{
  tone(9,349);
}
noTone(9);
}