Originally composed early in his career, Verdi later revised the score for Macbeth nearly 20 years later, and considered it one of the most important works in his legacy. Of particular note is Verdi's use of a female chorus in place of the three witches, adding an element of Greek tragedy to the opera. The quintessential Italian operatic "mad scene" showcases Lady Macbeth's famous "out, damn spot" sleepwalking scene to showstopping effect.