The term masterpiece (or chef 'œuvre) refers to any work of art that is considered extraordinary. The phrase is generally used to describe what is considered an artist's best piece of work. For example, Leonardo Da Vinci's Mona Lisa, Artemisia Gentileschi's Judith Slaying Holofernes, Michelangelo's David, William Shakespeare's Hamlet, Ludwig van Beethoven's Ninth Symphony, Leo Tolstoy's War and Peace, Miles Davis' Kind of Blue.