You can find it online and see for yourself

#include

sbit SPK=P1^2;

unsigned char Timer0_H,Timer0_L,Time;

code unsigned char MUSIC[]={ 0,0,6,1, 5,6,1,1, 5,6,4,3, 2,2 ,2,5, 5,2,4,3, 1,2,4,4, 6,1,2,4 };

code unsigned char FREQH[]={

0xF9,0xF9,0xFA,0xFA,0xFB,0xFB,0xFC,0xFC, //1,2,3,4,5 ,6,7,8,i

0xFC,0xFD,0xFD,0xFD,0xFD,0xFE,

0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFF,

} ;

// Lower eight digits of the scale frequency table

code unsigned char FREQL[]={

0x42,0xC1,0x17, 0xB6,0xD0,0xD1,0xB6,

0x21,0xE1,0x8C,0xD8,0x68,0xE9,0x5B,0x8F, //1,2,3,4,5,6,7,8,i

0xEE,0x44, 0x6B,0xB4,0xF4,0x2D, ??

0x47,0x77,0xA2,0xB6,0xDA,0xFA,0x16,

};< /p>

void DelayUs2x(unsigned char t)

{

while(--t);

}

void DelayMs(unsigned char t)

{

while(t--)

{

//Approximate delay 1mS< /p>

DelayUs2x(245);

DelayUs2x(245);

}

}

/*-- --------------------------------------------------

Beat delay function

Adjust 1/4 beat time:

Adjust 4/4 125ms

Adjust 2/4 250ms

Adjust 3/4 187ms

---------------------------------- -------------*/

void delay(unsigned char t)

{

unsigned char i;

for(i=0;i

DelayMs(250);

TR0=0;

}

void TIM0_ISR() interrupt 1

{

TR0=0;

SPK=!SPK;

TH0 =Timer0_H;

TL0=Timer0_L;

TR0=1;

}

void Song()

{

TH0=Timer0_H;//Assign timer time to determine frequency

TL0=Timer0_L;

TR0=1; //Open timer< /p>

delay(Time); //The beat required for delay

}

void main(void)

{

unsigned char k,i;

TMOD|=0x01;

EA=1;

ET0=1;

while(1)

{

i=0;

while(i<100)

{

Timer0_H=FREQH[k];

Timer0_L=FREQL[k];

Time=MUSIC[i+2];

i=i+3;

Song();

}

}

}