And so to the beginning: Naïve has mined the Vivaldi archive in Turin for its state-of-the-performing-art, stylishly presented Vivaldi edition, and is now filling in the gaps from other sources. Here is his amazing Op 1, published in Venice, showing a complete contrapuntal control of the trio sonata form, building on Corelli's achievements. You could not ask for better advocates than the sharp-edged L'Estravagante ensemble, whose wiry but flexible playing raises the current flourishing Italian baroque revival to new heights. Start with the tight-knit Sonata X, and save the dazzling variations of La Follia (placed first on the disc but last in the published set) till the end.