In a development described by music experts as "a bombshell in the world of Baroque opera", a new version of Vivaldi's opera Orlando Furioso has been discovered, 270 years after his death.

The manuscript has been dated to 1714, 13 years before Vivaldi composed his later masterpiece. It contains as many as 20 new arias, never heard before – all composed around the time that Vivaldi was also working on The Four Seasons, said to be the most-recorded piece of classical music in history.

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