D-Major is a musical key that is characterized by its bright and uplifting sound. It consists of two sharps: F# and C#. This key is often used in various genres of music, including classical, pop, and folk, making it a popular choice for composers and songwriters. In the context of music theory, the D-Major scale includes the notes D, E, F#, G, A, B, and C#. Many well-known pieces, such as Beethoven's "Symphony No. 9" and Vivaldi's "Spring," are composed in D-Major, showcasing its vibrant and joyful qualities.