What is a ritonello?

A ritornello is a recurring musical theme often found in Baroque concertos and other forms of instrumental music. It typically serves as a refrain that alternates with contrasting sections, showcasing the interplay between the soloist and the ensemble. The term "ritornello" comes from the Italian Word for "return," reflecting its repetitive nature throughout a piece. This structure helps to unify the composition and highlight the dynamic dialogue between different musical voices.