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Fig. 2 A double flat A flat A natural A sharp A double sharp

Figure 2 shows the accidentals that can be placed before a note to alter its pitch.

Accidental	Effect
Double flat	Lowers the pitch two half steps
Flat	Lowers the pitch one half step
Natural	Cancels an accidental
Sharp	Raises the pitch one half step
Double Sharp	Raises the pitch two half steps

Fig. 4 Ab A A# Bb B C C# Db D D# Eb E F F# Gb G G#

Figure 4 shows the notes in Figure 1 and all of half steps (H) inbetween. The red equal sign (=) shows that those notes and their respective accidentals represent the same pitch on the guitar. These are named enharmonic equivalents. Therefore, A# is the enharmonic equivalent of Bb (A# = Bb), C# = Db, D# = Eb, F# = Gb, G# = Ab.

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