Antonio Vivaldi’s twelve concertos op. 4 known by the name of “La Stravaganza” were first mentioned as a collection of “Concerti a 4” in the 1711 Foreword of “L’Estro Armonico” op. 3. Their publication had to wait until 1716, when Estienne Roger issued them in two volumes of six concertos each. However, unlike the original announcement, “La Stravaganza” is more than a collection of concertos for solo violin with string accompaniment: in five of the concertos the soloist is joined by a second sol...