Notice the three enharmonic keys at the bottom of the circle. On the piano, "B Major" and "Cb Major" are
played using exactly the same notes, as are "F# Major" and Gb Major," as well as "C# Major" and "Db
Major." Each of these pairs is essentially only one triangle on this circle, even though it can be called by the two
different names, depending on whether we are dealing with sharps or with flats.