It’s a theoretical key.Ī Sharp Major Scale: A#, B#, C#, D#, E#, F#, G#
But the key of A sharp is hardly used because of notation difficulties caused by the need for a double sharp. On your instrument, this key is the same as A sharp, in terms of the piano keys to be played. In this lesson we will take a look at notes and chords in the key of B flat.