---

const int buzzer = 12;
const int leds[7] = {2, 3, 4, 5, 6, 7, 8};
int notes[7] = {262, 294, 330, 349, 392, 440, 494}; // до ре ми фа соль ля си

void setup() {
  pinMode(buzzer, OUTPUT);
  for (int i = 0; i < 7; i++) pinMode(leds[i], OUTPUT);
}

void loop() {
  for (int i = 0; i < 7; i++) {
    digitalWrite(leds[i], HIGH);
    tone(buzzer, notes[i]);
    delay(10000);
    noTone(buzzer);
    digitalWrite(leds[i], LOW);
    delay(200);
  }
}