C-Minor is a musical key that is characterized by its somber and emotional quality. It consists of the notes C, D, E♭, F, G, A♭, and B♭. This key is often used in various genres, including classical, jazz, and popular music, to convey feelings of sadness or introspection. In music theory, C-Minor is the relative minor of E♭ Major, sharing the same key signature of B♭ and E♭. Composers like Ludwig van Beethoven and Frédéric Chopin have famously utilized this key in their works, showcasing its expressive potential through various compositions.