Ritornello

In Baroque music, ritornello was the word for a recurring passage for orchestra in the first or final movement of a solo concerto or aria (also in works for chorus). In ritornello form, the tutti opens with a theme called the ritornello (refrain). This theme, always played by the tutti, returns in different keys throughout the movement. However, it usually returns in incomplete fragments. It was favoured by composers such as Bach, Vivaldi and Handel and was used frequently in concertos, chamber works and vocal and choral pieces, though most prominently in the solo concerto where it created a ‘tutti-solo-tutti-solo-tutti’ pattern, with the ritornello being the ‘tutti’ section. When the classical music era started, the ritornello form was altered to resemble sonata form, though it later transformed to become rondo form.
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n. refrain, verse or phrase that is repeated during a song or poem

(n.)
A short return or repetition; a concluding symphony to an air, often consisting of the burden of the song.
  

(n.)
A short intermediate symphony, or instrumental passage, in the course of a vocal piece; an interlude.
  

Eng: ritornello
Urdu: (موسیقی) نَغمے کے دَوران ساز پَر بَجائی جانے والی موسیقی ۔