Tchaikovsky wrote "The Nutcracker" for an orchestra of strings, woodwinds, brass, and percussion. To this orchestra he added a "celesta" for the "Dance of the Sugar Plum Fairy" in Act 2 and children's instrumentsdrums, trumpets, cymbals, bird calls, whistles, and a rattlefor the Christmas party in Act 1. The instruments were specially ordered and tuned to Tchaikovsky's orders. The rattle is heard in the orchestra pit when Fritz cracks nuts in Act 1, and the other instruments are heard when the boys make a lot of noise while Clara comforts the broken Nutcracker.