D-flat major is a musical key that consists of five flats in its key signature: B-flat, E-flat, A-flat, D-flat, and G-flat. It is often associated with a warm and rich sound, making it popular in various musical genres, including classical and jazz. In terms of scale, the D-flat major scale includes the notes D-flat, E-flat, F, G-flat, A-flat, B-flat, and C. Composers like Frédéric Chopin and Johannes Brahms have utilized this key in their works, showcasing its expressive qualities and emotional depth.