Merbecke's creed is actually and adaptation of Credo III
It must be borne in mind that it contains no new compositions. All that Merbecke did was to adapt the ancient melodies of the Church to the English words of the Te Deum, Benedictus, &c., and apply the rules of ecclesiastical accent to the suffrages, &c.
Kenneth Long states that " the ninefold Kyrie was a simplified version of the Kyrie from the ancient Mass for the Dead, • • • the Sanctus and Benedictus were derived from the Mode II setting of In Dominicis, whilst the Agnus Dei was adapted from an old Sarum melody". -- Long, The Music of the English Church, p. 29.
The Gloria and Credo, on the other hand, are believed to be Merbecke's own compositions, although they do indeed "retain their ancient and familiar intonations", and "here and there are derived from, or are faintly reminiscent of, the Fourth Mode Mass In Festis Duplicibus" -- Long, p. 29.
Archbishop Howard Clark further recorded:
Thus he [Willan] taught us to sing Plain Chant, or at least to know something of what it is all about. • • • As he worked with us, I got a vision of Church music that is truly vulgar -- that is of the people, and which has none of that dehumanized respectability and painful correctness that some choirs seem to aim at.
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