As a warm up, have a look at the key signature, the flat and the sharp. If you’re not in the mood, let’s skip ahead. Usually, music compositions are written in a specific key or scale (don’t worry, both terms are the same thing). What would happen if we wanted to include notes that do not belong in the scale we are in? Be patient. Do we have to change the scale? We could. But what happens if we don’t want to change the scale? Simple: we use accidentals. Accidentals are the symbols of sharps, flats or naturals that are written before the notes we want to change. In case we are in the scale of A minor (A minor doesn’t have a key signature, as every note is a white key on the piano keyboard), we usually see the G sharpened and sometimes the F, as well. Bit of extra info: This sharpened G creates a minor third which has this nice, slightly melancholic and exotic Middle Eastern sound. These two notes, G and F, are not part of the key signature. They are notated as accidentals, no matter how common they are within the piece.