int NOTE_C4=262; //DO
int NOTE_D4=294; //RE
int NOTE_E4=330; //MI
int NOTE_F4=349; //FA
int NOTE_G4=392; //SOL
int NOTE_A4=440; //LA
int NOTE_B4=494; //SI
int NOTE_C5=523; //DO


int melody[]={NOTE_C4,NOTE_D4,NOTE_E4,NOTE_F4,NOTE_G4,NOTE_A4,NOTE_B4,NOTE_C5};

int piezo=8;

void setup() {
  pinMode(piezo, OUTPUT);
}

void loop() {
  for(int x=0;x<8;x++){
    tone(piezo,melody[x],500);
    delay(500);
  }
  delay(1000);
  for(int x=7;x>=0;x--){
    tone(piezo,melody[x],500);
    delay(500);
  }
  delay(1000);
}