He was a man of experimentation and varying trends, using happy and elegant aesthetics of Baroque music of the past during his younger years and became a bit more serious and grim on his maturity yet had regained his old charisma and originality of his youth, creating masterpiece after masterpiece during the last two decades of his life.
Haydn was full of musical ingenuity and was and still is revered as the master before the masters (Mozart, Beethoven, etc.) whose work sits at the upper echelon of magnificence.
Learn more about the composer’s fairy-tale “rags to riches” life at: https://galaxymusicnotes.com/pages/about-joseph-haydn