La stravaganza: 12 Concertos, Op. 4 is a set of twelve violin concertos by Italian Baroque composer Antonio Vivaldi, published in 1716. The concertos exemplify Vivaldi's Baroque concerto style with virtuosic solo violin writing contrasted with string ripieno and continuo textures, and they represent a significant stage in his development of the solo concerto form that influenced the genre's evolution in the eighteenth century.