It was originally scored for a chamber group of flute/piccolo , clarinet -LRB- B flat and C -RRB- , two pianos , glass armonica , xylophone , two violins , viola , cello and double bass , but is usually performed today with a full orchestra of strings , and with a glockenspiel substituting for the rare glass armonica .

PERSON@1 arranged it for an orchestra consisting of flute doubling piccolo , clarinet -LRB- B flat and C -RRB- , two pianos , glass harmonica , xylophone , two violins , viola , cello and double bass .
