[Wegman 1987b] proposes attribution to Dufay for this setting, based on similarities between the rhythmisation of the 'O quam glorifica' melody in B-Br-ms-5557 and the rhythmisation of the same setting found in Cambrai-BM-6. The latter setting was attributed to Dufay by Rudolf Bockholdt in 1979. Wegman argues that the setting found in B-Br-ms-5557 is the lost Dufay setting from 1463, where the Cambrai setting is an early Dufay hymn.

[Curtis 1979b]: 'The chant is in white notation with ligatures that suggest a mensural significance unsupported by the sense of the music. As with the 'Vexilla regis' [on fol. 121r ], the first verse is underlaid, and the remaining verses set out below.' /

B-Br-ms-5557: Tenor only