very historical discipline has its share of documents that once were known to scholars and used by them and then disappeared without leaving a hint as to their fate. We reconcile ourselves to the loss of such things when we know they have been destroyed but harbor the hope that those that vanished under unknown circumstances are only mislaid, not gone forever. And sometimes this hope is rewarded by the rediscovery of a missing item. This, happily, has been the case with a sumptuously decorated 16th-century choirbook belonging to the Cathedral of Toledo, Spain. This manuscript, previously unnumbered but now bearing the siglum MS Reservado 23, initially was brought to the attention of the musicological world in 1923 by Felipe Rubio Piqueras, then organist of the Toledan Cathedral, in his Musica y mtisicos toledanos' and then again in 1925 in his Codices polif6nicos toledanos, where he repeated verbatim his brief remarks of 1923.2 These consisted of a statement to the effect that the book
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