int BuzzerPin = 9;

 char noteNames[] = {'z','x','c','v','b','n','m'};

 int frequency[] = {1047,1175,1319,1397,1568,1760,1976};

 byte noteCount = sizeof(noteNames);

 void setup(){

     Serial.begin(9600);

 }

 void loop(){

     if (Serial.available()>0){

     int duration = 333;

     char score = Serial.read();

     playNote(score, duration);

     }

 }

 void playNote(char note, int duration){

     for (int i=0 ; i<noteCount ; i++){

         if (noteNames[i] == note)

             tone(BuzzerPin, frequency[i], duration);

     }

     delay(duration);

 }