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The Mexican music in this volume extends into the first quarter of the eighteenth century and contains the works of four composers: Antonio Rodriguez Mata, Antonio de Salazar, Miguel de Sumaya, and Francisco Lopez Capillas. The earliest of the four composers is Mata, who officially became chapelmaster of the Mexico City Cathedral in 1625. The two choirbooks, identified by their archival numbers, are Cathedral "Inventario: Departmento XXIX, Oficina 71, Obra No. 14 "and Cathedral "Inventario: Departmento XXIX. Oficina 71, Obra No. 24. "Both were transcribed by Simon Rodriguez de Guzman in 1717.""In preparing these transcriptions, which are intended for practical performance as well as for scholarly use, Barwick has shown how the music appeared in the original sources. Both choirbooks were written entirely in the conventional notation of the late sixteenth century. For this edition all note values have been reduced by one-half. The music has been transcribed from the choirbook format (soprano and alto parts in the upper portions of the book and tenor and bass parts in the lower) into a score at the original pitch. The original clefs and time and key signatures are provided at the beginning of each composition. For the transcription, modern clefs treble for soprano and alto, tenor (transposed treble) for tenor, and bass clef for the bass part have been used."