The "Musical Alphabet" or Chromatic Scale
If we begin the “Musical Alphabet” or Chromatic Scale from A, it will end with G, going back to A again. The entire 12-note scale spells: A, A#, B, C, C#, D, D#, E, F, F#, G, G# and A. There is a “#” or Sharp sign after every letter ascending. Descending, the 12-note scale Chromatic Scale spells: A, Ab, G, Gb, F, E, Eb, D, Db, C, B, Bb and A. There is a “b” or Flat sign after every letter moving backwards.