Before analyzing other kind of accidentals (Natural Sign, Double Flat and Double Sharp), it’s worth to mention that besides having these accidentals that are the Key Signature, the composer can also add other accidentals to the sheet music. Check it below:
In this case, the application is really obvious; a sharp beside a C indicates that you should play C#. Pay attention in one important detail; this “#” works for the whole bar line! So, if you have another C in the same bar line, this one will also be sharp (despite it is not indicated). And the next bar line will not have any changes. Remember that: the accidentals have power only in the bar line that they are inserted! The logic is the same for flats.
Observation: bar line is the space between two vertical bars | |. We will talk more about this when we explain about rhythm in the sheet music.
Let’s see then other accidentals that eventually will appear:
This is the Double Flat. When you see it, besides decreasing one semitone (flat), decrease two!
Even if it has nothing to do with the sign of sharp, this is the Double Sharp. It indicates that you have to increase two semitones.
The last one is the sign that cancels the sharps and flats accidentals. It is called “Natural Sign”. It is used in two ways:
To cancel an accidental inside a bar line (highlighted in red):
To cancel an accidental of a Key Signature:
Observation: As the accidentals themselves, the Natural Sign has power only inside the same bar line.
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