B Flat Major is a musical key that consists of the notes B♭, C, D, E♭, F, G, and A. It is often associated with a warm and rich sound, making it popular in various genres, including classical, jazz, and pop music. The key signature of B Flat Major has two flats, which are B♭ and E♭. In terms of scale degrees, the tonic is B♭, the dominant is F, and the subdominant is E♭. Many well-known compositions, such as Beethoven's "Piano Concerto No. 5," are written in B Flat Major, showcasing its versatility and emotional depth.