Play music using a Piezo sounder by pressing keys on the keyboard

music.pde

int speakerPin = 12;
int input = 0; 
int numNotes = 8;
int notes[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
int tones[] = {261, 294, 329, 349, 392, 440, 493, 523};


void setup()
{
  Serial.begin(9600);
}

void loop()
{
  if (Serial.available() > 0) {
    // read the incoming byte:
    input = (char)Serial.read();

    // say what you got:
    Serial.print("Playing Note: ");
    Serial.println(input);
    
    for(int i = 0; i < numNotes; i++)
    {
      if(notes[i] == input){
        tone(speakerPin, tones[i]);
        delay(500);
        noTone(speakerPin);
        break;
      } 
    }
  }
}

Circuit Diagram
http://i.imgur.com/vxJ3lDI.png