#define PIN_S0    2
#define PIN_S1    3
#define PIN_S2    4
#define PIN_ST    5
#define PIN_MOD   6
#define PIN_IC    7
#define PIN_PLAY  8

void play(int music_no)
{
	digitalWrite(PIN_ST, LOW );
	digitalWrite(PIN_MOD,HIGH);
	delay(10);

	switch(music_no) {
		case 1:
			digitalWrite(PIN_S2,LOW );
			digitalWrite(PIN_S1,LOW );
			digitalWrite(PIN_S0,LOW );
			break;
		case 2:
			digitalWrite(PIN_S2,LOW );
			digitalWrite(PIN_S1,LOW );
			digitalWrite(PIN_S0,HIGH);
			break;
		case 3:
			digitalWrite(PIN_S2,LOW );
			digitalWrite(PIN_S1,HIGH);
			digitalWrite(PIN_S0,LOW );
			break;
		case 4:
			digitalWrite(PIN_S2,LOW );
			digitalWrite(PIN_S1,HIGH);
			digitalWrite(PIN_S0,HIGH);
			break;
		case 5:
			digitalWrite(PIN_S2,HIGH);
			digitalWrite(PIN_S1,LOW );
			digitalWrite(PIN_S0,LOW );
			break;
		case 6:
			digitalWrite(PIN_S2,HIGH);
			digitalWrite(PIN_S1,LOW );
			digitalWrite(PIN_S0,HIGH);
			break;
	}
	delay(80);

	digitalWrite(PIN_ST, HIGH);
	digitalWrite(PIN_MOD,LOW) ;

	while(!digitalRead(PIN_PLAY));
	delay(80);
}

void setup()
{
	pinMode(PIN_S0,   OUTPUT);
	pinMode(PIN_S1,   OUTPUT);
	pinMode(PIN_S2,   OUTPUT);
	pinMode(PIN_ST,   OUTPUT);
	pinMode(PIN_MOD,  OUTPUT);
	pinMode(PIN_IC,   OUTPUT);
	pinMode(PIN_PLAY, INPUT );

	digitalWrite(PIN_ST,HIGH);
	digitalWrite(PIN_IC,LOW );
	delay(80);
	digitalWrite(PIN_IC,HIGH);

	for(uint8_t no=1;no<=6;no++) {
		play(no);
		delay(1000);
	}
}

void loop() {}

Platform: atmelavr
================================================================================================
ID                MCU        Frequency Flash RAM Name
----------------- ---------- --------- ----- --- -----------------------------------------------
pro8MHzatmega168  ATMEGA168  8MHz      14KB  1KB Arduino Pro or Pro Mini ATmega168 (3.3V, 8 MHz)
pro16MHzatmega168 ATMEGA168  16MHz     14KB  1KB Arduino Pro or Pro Mini ATmega168 (5V, 16 MHz)
pro8MHzatmega328  ATMEGA328P 8MHz      30KB  2KB Arduino Pro or Pro Mini ATmega328 (3.3V, 8 MHz)
pro16MHzatmega328 ATMEGA328P 16MHz     30KB  2KB Arduino Pro or Pro Mini ATmega328 (5V, 16 MHz)
sparkfun_megamini ATMEGA2560 8MHz      252KB 8KB SparkFun Mega Pro Mini 3.3V