Flat Major is a musical key that is characterized by its use of flat notes. In Western music, it typically refers to the scale that includes the notes B♭, C, D, E♭, F, G, and A. This key is often associated with a warm and mellow sound, making it popular in various genres, including jazz and classical music. The B♭ Major scale, which is the most common flat major key, consists of two flats: B♭ and E♭. Composers and musicians often choose this key for its rich tonal qualities, and it is frequently used in orchestral works, band arrangements, and choral music.