It is now more than twenty years since the appearance of The New Monteverdi Companion, edited by Denis Arnold and Nigel Fortune, to whom this book is dedicated. During those years the re-evaluation of Monteverdi and his work by performers and historians alike has proceeded apace and shows no sign of abating. New generations of performers now work comfortably with the instruments of Monteverdi's day and continue to explore the types of vocal production with which he might have been familiar; and listeners can now experience a wide range of live and recorded interpretations of Monteverdi's music. More is known now about the context in which Monteverdi worked, and fresh questions have been asked about his musical output, not least those arising from the so-called "New Musicology". On his operas alone three new books have appeared within the last five years.