what is the key signature for b flat major
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.