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, Telemann and Handel and was used frequently in concertos… (More on Ritornello)