One semitone (or half step) up from an F is F sharp. (This
is a black key on the piano). We put the sharp before the note.
Here is F sharp and G twice. If there is already a sharp in a
bar, you
don't need to put the sharp in again if the note is repeated.
Click
the play arrow twice.
Here is F NATURAL and G (No sharp here)
Click the play arrow twice.
Here is F, F sharp and G. Listen carefully.
Click
the play arrow twice.