int buz = 9;
int ledR = 6;
int ledB = 5;

void setup() {
  pinMode(ledR, OUTPUT);
  pinMode(ledB, OUTPUT);
}

void loop() {
  tone(buz, 528 );
  digitalWrite(ledR, HIGH);
  digitalWrite(ledB, LOW);
  delay(500);
  tone(buz, 704.88 );
  digitalWrite(ledR, LOW);
  digitalWrite(ledB, OUTPUT);
  delay(500);
}