Exploring melody & light sensor

Melody : http://www.youtube.com/watch?v=dwZasBcaBrg&feature=youtu.be
Copied from : http://www.arduino.cc/en/Tutorial/Melody

int speakerPin = 9;

int length = 15; // the number of notes
char notes[] = "ccggaagffeeddc "; // a space represents a rest
int beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 };
int tempo = 300;

void playTone(int tone, int duration) {
  for (long i = 0; i < duration * 1000L; i += tone * 2) {
    digitalWrite(speakerPin, HIGH);
    delayMicroseconds(tone);
    digitalWrite(speakerPin, LOW);
    delayMicroseconds(tone);
  }
}

void playNote(char note, int duration) {
  char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
  int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };

  // play the tone corresponding to the note name
  for (int i = 0; i < 8; i++) {
    if (names[i] == note) {
      playTone(tones[i], duration);
    }
  }
}

void setup() {
  pinMode(speakerPin, OUTPUT);
}

void loop() {
  for (int i = 0; i < length; i++) {
    if (notes[i] == ' ') {
      delay(beats[i] * tempo); // rest
    } else {
      playNote(notes[i], beats[i] * tempo);
    }

    // pause between notes
    delay(tempo / 2); 
  }
}

Sensor:  http://www.youtube.com/watch?v=8xV-hgJqBA8&feature=youtu.be
void setup() {
  pinMode(13, OUTPUT);
  delay(2000);
}
void loop() {
  int sensorValue = analogRead(A0);
if (sensorValue > 300) { // Change Light Sensitivity by changing this value.
    digitalWrite(13, HIGH);
  analogWrite(3, 100);
  delay(1000);
  analogWrite(3, 150);
  delay(1000);
  }
  else {
       digitalWrite(3, LOW);
  }
}