Rather than use a key signature that would in theory contain double sharps or flats, usually the key signature of the replacement major scale - A, above is used, as shown below. ![]() > The A major scale sounds the same / contains the same note pitches, which are played in the same order (the scales are enharmonic), so it can be used as a direct replacement for the B-double-flat major scale. > There is always an identical major scale that you can use in its place, which is on the Circle of 5ths. > It is not on the Circle of fifths diagram, which contains the most commonly used keys. > It is rarely used in practice, because it is too complex to use. > Its key signature would contain either double-sharps or double flats. Warning: The B-double-flat key is a theoretical major scale key. B-double-flat major scale has 2 double-flats, 5 flats No. This step shows the Bbb major scale key signature on the treble clef and bass clef.
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