doubt regarding music generation using at89c51

Code C - [expand]
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#include<reg51.h>
sbit out=P1^0;  //output pin 1
 
void delay(unsigned char p,unsigned char q)
{
TMOD=0x01;  //timer0 mode1(16 bit)
TL0=q;      //load TL0
TH0=p;      //load TH0
TR0=1;   //turn on T0
while(TF0==0); // wait for flag generation
TR0=0;   // turn off T0
TF0=0;    // clear TF0
}
 
void play(unsigned char j,unsigned char k)
{
int i;
for(i=0;i<1000;i++)  //to play sound
{
  out=1;
  delay(j,k);
  out=0;
  delay(j,k);
}
}
 
void main()
{
int l;
while(1)
{
  play(0xfc,0x66);  //playing sound of frequency of about 500 hertz with a delay between two frequencies
  for(l=0;l<5;l++)   
  {
   delay(0x00,0x00);  //delay of 71 miliseconds
  }
  play(0xfe,0x33);  //playing sound of frequency of about 1000 hertz with a delay between two frequencies
  for(l=0;l<5;l++)
  {
   delay(0x00,0x00);  
  }
  play(0xff,0xa3);  //playing sound of frequency of about 5000 hertz with a delay between two frequencies
  for(l=0;l<5;l++)
  {
   delay(0x00,0x00);  
  }
  play(0xff,0xd1);  //playing sound of frequency of about 10000 hertz with a delay between two frequencies
  for(l=0;l<5;l++)
  {
   delay(0x00,0x00);  
  }
  play(0xff,0xdc);  //playing sound of frequency of about 13000 hertz with a delay between two frequencies
  for(l=0;l<5;l++)
  {
   delay(0x00,0x00);  
  }
  play(0xff,0xcc);  //playing sound of frequency of about 9300 hertz with a delay between two frequencies
  for(l=0;l<5;l++)
  {
   delay(0x00,0x00);  
  }
  play(0xff,0xe8);  //playing sound of frequency of about 20000 hertz with a delay between two frequencies
  for(l=0;l<5;l++)
  {
   delay(0x00,0x00);  
  }
} 
}