C♯ Minor is a musical key that is based on the note C♯. It consists of the notes C♯, D♯, E, F♯, G♯, A, and B. This key is often associated with a somber or melancholic mood, making it popular in various genres, including classical and contemporary music. In terms of scale structure, C♯ Minor follows the natural minor scale pattern, which includes whole and half steps. The key signature of C♯ Minor has four sharps, which are F♯, C♯, G♯, and D♯. This key is frequently used in compositions by famous composers like Ludwig van Beethoven and Frédéric Chopin.