The Nutcracker, Op. 71, is an 1892 two-act classical ballet by Pyotr Ilyich Tchaikovsky, set on Christmas Eve at the foot of a Christmas tree in a child's imagination. The plot is an adaptation of Alexandre Dumas' 1844 short story The Nutcracker, itself a retelling of E. T. A. Hoffmann's 1816 short story The Nutcracker and the Mouse King. The ballet's first choreographer was Marius Petipa, with whom Tchaikovsky had worked three years earlier on The Sleeping Beauty, assisted by Lev Ivanov. Although the complete and staged The Nutcracker ballet was not initially as successful as the 20-minute Nutcracker Suite that Tchaikovsky had premiered nine months earlier, it became popular in later years.