You are probably wondering, “How can one know where the half steps and whole steps occur?” The answer is that the “clef” tells you. Clef means “key,” and it truly is the key to discovering the melody. There are two kinds of clefs: a “Do Clef” and a “Fa Clef.” The Do clef tells you where Do is. The Fa Clef tells you where Fa is.
As you can probably guess, the placement of the clef makes a tremendous difference to the way the piece sounds. In the following video demonstration, notice how different a little tune can sound when the clef is moved: