E Minor is a musical key that is often associated with a somber or melancholic mood. It is built on the note E and consists of the notes E, F#, G, A, B, C, and D. The key signature of E Minor has one sharp, which is F#. In music, E Minor is frequently used in various genres, including classical, rock, and folk. Many famous pieces, such as Beethoven's "Moonlight Sonata" and Metallica's "Nothing Else Matters," are composed in this key, showcasing its emotional depth and versatility.