In the rented car that brought us here yesterday the radio played a Vivaldi Psalm for alto, in several movements, called Nisi Dominus. But one of the movements isn't Vivaldi's, it's by Villa-Lobos. Sly fox, his famous fifth Bachiana brasilieras isn't filched from Bach at all, but note for note from Vivaldi. Yes of course it's his too, like Borge's Don Quixote.