Diving into Vivaldi's Orlando furioso with Jean-Christophe Spinosi, Matheus Ensemble, and a shockingly good cast is enough to make even the most jaded listener smile. It is fresh, unrelentingly impressive, and entertaining to a fault. The opera is over-plotted: the first paragraph of the synopsis is enough to confuse anyone not taking notes. And listening to the entire thing would amount to more flowery, athletic vocalism than most can stand in one sitting. But those with the remotest interest in Vivaldi opera, or opera at all, will be hard pressed not to marvel at the quality of what's recorded here. Spinosi is a brilliant Vivaldian who pulls sweet-toned lyricism and down-and-dirty sawing from his Matheus Ensemble, making the most of the composer's rich orchestration. And the cast pulls one rabbit after another out of its collective hat, tackling Vivaldi's consummately difficult arias with élan. Clearly, the folks at Naïve (along with their subsidiaries Opus 111 and Astrée) have found a rich vein to mine in Vivaldi's operas; they are going to be a tough act to follow.