B-flat Minor is a musical key that consists of the notes B♭, C, D♭, E♭, F, G♭, and A♭. It is known for its dark and somber sound, often used to convey deep emotions in music. This key is commonly found in various genres, including classical, jazz, and popular music. In terms of scale structure, B-flat Minor is the relative minor of D-flat Major. It features a minor third interval between the root note B♭ and the third note D♭. Composers like Frédéric Chopin and Johannes Brahms have utilized this key to create expressive and poignant works.