#include "pitches.h"

#define SPEAKER_PIN 8
const uint8_t buttonPins[]= {12, 11, 10, 9, 7, 6, 5, 4};
const int buttonTones[] = {
  NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4,
  NOTE_G4, NOTE_A4, NOTE_B4, NOTE_C5
};
const int numTones = sizeof(buttonPins) / sizeof(buttonPins[0]);

void setup(){
  for (uint8_t i = 0; i < numTones; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }
   pinMode(SPEAKER_PIN, OUTPUT);
}

void loop() { 
  int pitch = 0;
  for (uint8_t i = 0; i < numTones ; i++ ) {
    if (digitalRead(buttonPins[i]) == LOW) {
      pitch = buttonTones [i];
    }  
}
if (pitch) {
  tone(SPEAKER_PIN, pitch);
} else{
  noTone(SPEAKER_PIN);
}
}