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Twelve concerti grossi, Op. 6, is a collection of twelve concerti written by Arcangelo Corelli probably in the 1680s but not prepared for publication until 1714. They are among the finest and first examples of concerti grossi: concertos for a concertino group (here a 1st violin, a 2nd violin and a cello) and a ripieno group of strings with continuo. Their publication – decades after their composition and after Italian composers had moved to favor the ritornello concerto form associated with Vivaldi – caused waves of concerto grosso writing in Germany and England, where in 1739 George Frideric Handel honored Corelli directly with his own "Opus 6" collection of twelve.