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 instruments, such as the trumpet and clarinet, are commonly tuned to B-flat, which means they play in this key more naturally. This key is frequently used in orchestral and band compositions.