fan·ta·sia /fænˈteʒə, z(h)iə; ˌfæntəˈziə/
  幻想曲
  Fan·ta·si·a n.  Mus. A continuous composition, not divided into what are called movements, or governed by the ordinary rules of musical design, but in which the author's fancy roves unrestricted by set form.
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  fantasia
       n : a musical composition of a free form usually incorporating
           several familiar themes