int speakerPin = 9;
int length = 1;
char notes[] = "c";
int beats[] = {1};
int tempo = 125;

void playTone(int tone, int duration)
{
  for (long i = 0; 1 < duration * 1000L; i += tone * 2)
  {
    digitalWrite(speakerPin, HIGH);
    delayMicroseconds(tone);
    digitalWrite(speakerPin, LOW);
    delayMicroseconds(tone);
  }
}

void playNote(char note, int duration)
{
  char names[] = {'c'};
  int tones[] = {1915};
  for (int i = 0; i < 8; i++)
  {
   if (names[i] == note)
   {
    playTone(tones[i], duration);
   }
  }
}


void setup()
{
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
pinMode(10, OUTPUT);
pinMode(speakerPin, OUTPUT);
}

void loop() {

for (int i = 0; i < length; i++)
{
	 if (notes[i] == 'c')
  {
    playNote(notes[i], beats[i] * tempo);
    delay(beats[i] * tempo);
    delay(tempo / 2);

	  digitalWrite(13, HIGH);
        delay(50);
        digitalWrite(12, HIGH);
        delay(50);
        digitalWrite(11, HIGH);
        delay(50);
        digitalWrite(10, HIGH);
        delay(50);
        digitalWrite(13, LOW);
        delay(50);
        digitalWrite(12, LOW);
        delay(50);
        digitalWrite(11, LOW);
        delay(50);
        digitalWrite(10, LOW);
        delay(50);
  }
}
}