A Mass by the Portuguese composer Duarte Lobo (c. 1565-1646) based on the four-voice motet by Palestrina. The most fascinating moment occurs in the Agnus Dei: Duarte Lobo points to a single note of the Cantus with an enigmatic canon with this single indication: Cantus secundus. Sic eum volo manere. The words have a symbolic meaning and have a close relation with the original motet, dedicated to St. John the Apostle: in John 21:22-23 Jesus says Si sic eum volo manere donec veniam, quid ad te? Tu me sequere ("If I will that he remain till I come, what is that to you? You follow me."). This means that the Cantus secundus must remain on that single note (that is, that voice must repeat one single note on the whole Agnus Dei).
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