In contrast, a chord is when you play two or more notes simultaneously. For example, if I play three notes C, F, and G altogether; it's a chord. Chords generally provide the bass section to a music.

If you keep playing the same chord over and over again it will sound monotonous—so you jump from one chord—again following a rule. This is called chord progression.  More simply, an ordered series of chords is called a chord progression.

The musical notes can be written on a music sheet or score sheet that comprises of five lines. The notes are represented by black dots, which can lie on the line or in spaces between them. The names of notes for two octaves are shown on the following score sheet. The icon marked as treble clef means that these notes are to be played with the right hand:

Do not worry, we are not required to memorize the music notation for completing our program. We will, however, use it as a reference when drawing the score sheet.

We are now equipped with all the musical knowledge required to write this program. Let's start coding.