i-Duino UNO R3B with Mary Had A Little Lamb Melody

/*************************************************
 * Public Constants
 *************************************************/

#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978

 #define SOUND_PIN 20

// notes in the melody:
int runCircle;
int melody1[] = {
  NOTE_A5, NOTE_G5, NOTE_F5, NOTE_G5, NOTE_A5, NOTE_A5, NOTE_A5,
  NOTE_G5, NOTE_G5, NOTE_G5, NOTE_A5, NOTE_C6, NOTE_C6,
  NOTE_A5, NOTE_G5, NOTE_F5, NOTE_G5, NOTE_A5, NOTE_A5, NOTE_A5,
  NOTE_A5, NOTE_G5, NOTE_G5, NOTE_A5, NOTE_G5, NOTE_F5
};
void setup(){
  pinMode(13,OUTPUT);
  pinMode(SOUND_PIN,OUTPUT);
  Serial.begin(9600);
}
void loop(){
    for(runCircle=0;runCircle<26;runCircle++)
      {
        digitalWrite(13,HIGH);
        tone(SOUND_PIN,melody1[runCircle],250); //normal Delay Sound ON Time 2.5 Seconds
        digitalWrite(13,LOW);
        if(runCircle==6 || runCircle==9 || runCircle==12){delay(1000);} //extend Delay Time 1 Second
        else{delay(500);} //normal Delay Time 0.5 Second
      }
      noTone(SOUND_PIN);delay(1000);
}