attiny13 imperial march

#include <avr/pgmspace.h>

// by @tartakynov
// programmed for ATtiny13 in Arduino IDE using core13 http://sourceforge.net/projects/ard-core13/

#define PIN_LED 1
#define PIN_BUZZER 0
#define COUNT_NOTES 39

word frequences[COUNT_NOTES] PROGMEM = {
                                392, 392, 392, 311, 466, 392, 311, 466, 392,
                                587, 587, 587, 622, 466, 369, 311, 466, 392,
                                784, 392, 392, 784, 739, 698, 659, 622, 659,
                                415, 554, 523, 493, 466, 440, 466,
                                311, 369, 311, 466, 392 };
word durations[COUNT_NOTES] PROGMEM = {
                                350, 350, 350, 250, 100, 350, 250, 100, 700,
                                350, 350, 350, 250, 100, 350, 250, 100, 700,
                                350, 250, 100, 350, 250, 100, 100, 100, 200,
                                100, 350, 250, 100, 100, 100, 200,
                                100, 350, 250, 100, 750 };

void setup()
{
    pinMode(PIN_LED, OUTPUT);
    pinMode(PIN_BUZZER, OUTPUT);
}

void loop()
{
    for (byte i = 0; i < COUNT_NOTES; i++)
    {
        buzz(PIN_BUZZER, pgm_read_word(&(frequences[i])), 2 * pgm_read_word(&(durations[i])));
        delay(100);
    }
    delay(3000);
}

void buzz(unsigned char pin, word frequencyInHertz, word timeInMilliseconds)
{
    long delayAmount = (long)(long(1000000) / (long)frequencyInHertz);
    long loopTime = (long)(((long)timeInMilliseconds * 500) / delayAmount);
    for (long i = 0; i < loopTime; i++)
    {
        digitalWrite(pin, HIGH);
        delayMicroseconds(delayAmount);
        digitalWrite(pin, LOW);
        delayMicroseconds(delayAmount);
    }
}