the order of sharps in a key signature is
Key signature Put another way: for key signatures with sharps, the first sharp is placed on F with subsequent sharps on C, G, D, A, E and B; for key signatures with flats, the first flat is placed on B with subsequent flats on E, A, D, G, C and F. There are thus 15 conventional key signatures, with up to seven sharps or flats and including the empty signature of C major (A minor).
B-flat major In music theory, B♭ major is a major scale based on B♭, with pitches B♭, C, D, E♭, F, G, and A. Its key signature has two flats. Its relative minor is G minor, and its parallel minor is B♭ minor (not used enharmonically as A♯ minor). A♯ major, its enharmonic, has three double-sharps, which makes it impractical to use.