D Major is a musical key that is often associated with bright and uplifting emotions. It consists of two sharps: F# and C#. This key is commonly used in various genres of music, from classical to pop, making it a favorite among composers and musicians alike. Many famous pieces, such as Beethoven's Symphony No. 9 and Vivaldi's "Spring" from The Four Seasons, are written in D Major. The key's cheerful sound makes it perfect for celebrations and joyful occasions, allowing listeners to feel a sense of happiness and energy when they hear it.