Topmusicanswers
Sharp is #, flat is lower-case b, natural is the letter name of the note with nothing next to it, double sharp or double flat is ##, bb.
Is a double flat a natural?
The notes F♭, C♭, E♯, B♯, and most notes inflected by double-flats and double-sharps correspond in pitch with natural notes; however, they are not regarded as natural notes but rather as enharmonic equivalents of them and are just as much chromatically inflected notes as most sharped and flatted notes that are ...
What is a double natural?
The double natural is an accidental symbol that completely cancels the effects of a double sharp or double flat symbol. The double natural consists of two natural signs to the left of the note to be altered. As with all accidental symbols, this only effects the notes with that exact pitch in the same measure.
What does a double flat do to a note?
An accidental sign consisting of two flat symbols (♭♭) that lower a note by two half steps (two semitones). The double flat symbol alters the pitch of the note to which it is attached as well as any subsequent occurrence of the same note (identical line or space) in the same measure.
