Piezzo piano with buttons

const int activepiezzopin = 11;
const int buttons = A0;
int notes [] = {261, 392, 440, 349};
void setup()
{
  pinMode (activepiezzopin, OUTPUT);
  pinMode (buttons, INPUT);
  Serial.begin (9600);

}

void loop()
{
  int buttonval = analogRead (A0);
  Serial.println (buttonval);
  if (buttonval > 0 && buttonval < 100)
  {
    tone (activepiezzopin, notes[0], 200);
  }
  else if (buttonval > 500 && buttonval < 600)
  {
    tone (activepiezzopin, notes[1], 200);
  }
  else if (buttonval > 995 && buttonval < 1010)
  {
    tone (activepiezzopin, notes[2], 200);
  }
  else if (buttonval == 1023)
  {
  tone (activepiezzopin, notes[3], 200);
  }
  else
  {
    noTone (activepiezzopin);
  }

}