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Correct and Incorrect Notation:

In the above example for the G major scale, notice that the F# could also be called Gb. These are called enharmonic tones because the two letters both represent the exact same note. The key to knowing which enharmonic tone to use is you need to use every note from A to G one time in the major scale. So you wouldn’t want to have two G notes (Gb and G) and no F notes.

An example of Incorrect Notation:
G A B C D E Gb G - Using two different G notes (Gb and G) and no F notes is incorrect notation.

Correct Notation:
G A B C D E F# G - Uses each letter of the musical alphabet one time.