Daniel Lawson Piezo with Photoresistor

int sensorValue;
int sensorLow = 1023;
int sensorHigh = 0;
const int ledPin = 13;
const int photoR = A1;
const int piezo1 = 8;





void setup()
{
  pinMode(ledPin,OUTPUT);
  digitalWrite(ledPin, HIGH);

  while(millis() < 5000)
  {
    sensorValue = analogRead(photoR);
    if (sensorValue > sensorHigh)
    {
      sensorHigh = sensorValue;
    }
    if (sensorValue < sensorLow)
    {
      sensorLow = sensorValue;
    }
  }

  digitalWrite(ledPin,LOW);
}

void loop()
{
sensorValue = analogRead(photoR);

int pitch = map(sensorValue, sensorLow, sensorHigh,50, 4000);

tone(piezo1,pitch,20);

delay(10);



}