int i;

void setup() {
  pinMode(LED_BUILTIN, OUTPUT); // Why LED? 
}

void loop() {
  tone(LED_BUILTIN,250,100);
  delay(500);
  tone(LED_BUILTIN,500,250);
  delay(500);
  tone(LED_BUILTIN,190,80);
  for (i = 1000 ; i >= 850 ; i--)
    tone(LED_BUILTIN,i,4);
  delay(500);
}