 Lucia descends into madness, and on her wedding night, while the festivities are still being held in the Great Hall, she stabs her new husband, Arturo, in the bridal chamber.Disheveled, unaware of what she has done, she wanders in the Great Hall, recalling her meetings with Edgardo and imagining herself married to him.Donizetti intended the aria to be accompanied by the eerie sound of the glass harmonica, though this instrument is often replaced in performance by a flute.