#### Example: a program that plays a sequence of musical notes

We can complicate the previous program by giving for execution repeating commands in a loop for playing a sequence of notes with rising height:

for (i = 200; i <= 4000; i += 200)
{
Console.Beep(i, 100);
}


In the example above we made the computer play one after another for a very short time (100 miliseconds) all of the notes with height 200, 400, 600 etc. Hz until they reach 4000 Hz. The result of the program is playing something like a melody.

How do iterations (cycles) work in programming, we will learn in the chapter "Loops", but for now just accept that we repeat some command many times.