fantasia

[ fan-tey-zhuh, -zhee-uh, fan-tuh-zee-uh ]

/ fænˈteɪ ʒə, -ʒi ə, ˌfæn təˈzi ə /

Music.

a composition in fanciful or irregular form or style.
a potpourri of well-known airs arranged with interludes and florid embellishments.

something considered to be unreal, weird, exotic, or grotesque.

Origin of fantasia

From Italian, dating back to 1715–25; see origin at fantasy

What do we remember more fondly: Fantasia torching a rendition of “Summertime?”

Jennifer Lopez, Keith Urban, and Harry Connick Jr. Will Save ‘American Idol’ |Kevin Fallon |September 3, 2013 |DAILY BEAST
He is going to play my Fantasia to-night, Rosa, before the aristocracy; he is going to let me lead his orchestra!

The Ghetto |Herman Heijermans
Fantasia of Americans vs. the "old aristocracy," "The American" with the sexes reversed.

Instigations |Ezra Pound
The second part of the fantasia is occupied by a succession of recitatives of an extremely graphic and poetic character.

A Popular History of the Art of Music |W. S. B. Mathews

The Algerine coast has enriched our language with at least two words, respectively warlike and peaceful—razzia and fantasia.

Lippincott's Magazine of Popular Literature and Science |Various
What genius could have composed the Fantasia in C without such a passion!

Life of Beethoven |Anton Schindler

fantasia

/ (fænˈteɪzɪə, ˌfæntəˈzɪə) /

any musical composition of a free or improvisatory nature

a potpourri of popular tunes woven freely into a loosely bound composition

another word for fancy (def. 13)

C18: from Italian: fancy; see fantasy