C# Minor is a musical key that is often associated with a somber or melancholic mood. It consists of the notes C#, D#, E, F#, G#, A, and B, forming a scale that is commonly used in various genres of music, including classical and contemporary. The key signature of C# Minor has four sharps, which can make it challenging for some musicians to play. In terms of harmony, C# Minor is closely related to its major counterpart, E Major, and shares many of the same chords. Composers like Johannes Brahms and Frédéric Chopin have utilized C# Minor in their works, showcasing its emotional depth and versatility. This key is often explored in piano compositions and orchestral pieces.