### Make simple music program with beep(freq, duration) with Pascal

Pascal is my first programing language when I have studied in high school. It was really exciting for me. :)

The Pascal programming language was created by Niklaus Wirth in 1970. It was named after Blaise Pascal, a famous French Mathematician. It was made as a language to teach programming and to be reliable and efficient. Pascal has since become more than just an academic language and is now used commercially.

I tried to make a simple music program by using Lazarus IDE on MS Window 7, 64-bit. It frustrated me a few times how difficulty to use Sound command to make a sound. Sound did not work on my compiler and my platform anymore. So far, I just could use beep(freq, duration) from window unit to implement my work.

Here is my code. ;)
```program mysong;

uses
Windows,
crt;
const
C: Integer = 512;    { x = A * EXP(LN(2)/12)}
C_: Integer = 542;
D: Integer = 574;
D_: Integer = 608;
E: Integer = 644;
F: Integer = 682;
F_: Integer = 723;
G: Integer = 766;
G_: Integer = 812;
A: Integer = 860;
A_: Integer = 911;
B: Integer = 965;

WHITE: Integer = 1600;        {x = B/2}
BLACK: Integer =  800;
SINGLE: Integer = 400;
DOUBLE: Integer = 200;
TRIPLE: Integer = 100;

procedure play(freq,duration: Integer);
begin
Windows.Beep(freq,duration);
end;
begin
{ A Time For US }
Clrscr;
play(A, SINGLE);
play(C*2, SINGLE);
play(B, SINGLE);
play(E, BLACK + SINGLE);

play(E, SINGLE);
play(G, SINGLE);
play(E, SINGLE);
play(A, BLACK + SINGLE);

play(A, SINGLE);
play(G, SINGLE);
play(F, SINGLE);
play(G, BLACK + SINGLE);

play(G, SINGLE);
play(F, SINGLE);
play(E, SINGLE);
play(D, BLACK + SINGLE);

play(E, DOUBLE);
play(D, DOUBLE);
play(C, SINGLE);
play(D, SINGLE);
play(E, BLACK + SINGLE);

end.
```

I just chose frequency's Do note is 512. Next, I inferred the frequency of other notes by "afterNote = beforeNote * EXP(LN(2)/12)".

Reference:
[1]. http://kon-phum.com/tutors/pascal/programming_pascal_learn01.html
[2]. http://stackoverflow.com/questions/23249175/how-to-use-sound-in-pascal

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