B-Br-ms-6428: Composer name in ms = 'He[n]ric[u]s Ysac' / Title as in ms = 'De assumptione beate marie virginis' / Kyrie I: [Superius]: 'Virgo prudentissima quo progrederis quasi aurora valde rutilans filia Syon' (red ink); 'Virgo prudentissima' in all other voices / Christe I: Text above [Superius]: 'Criste primu[m] cu[m] vocibus mutatis; 'Discant[u]s 2[secundu]s': 'Criste primu[m] tacet / Christe II: 'Contratenor': 'Tota formosa' (red ink); 'Tenor': 'Et suavis' (red ink) / Kyrie II: [Superius]: 'Pulchra ut luna [electa] ut sol' (red ink) / Et in terra: 'Tenor' and 'Bassus [1]': 'Virgo prudentissima quo progrederis quasi aurora valde rutilans filia Sion' (red ink) / Qui tollis: 'Tenor' and 'Bassus [1]': 'Tota formosa et suavis es pulchra ut luna electa ut sol' (red ink) / Patrem: 'Tenor' and [Superius]: 'Virgo prudentissima quo progrederis valde rutilans filia sion' (incomplete in [Superius]) (red ink) / Et resurrexit: 'Tenor': 'Et suavis es pulchra ut luna' on fol. 75v and 77r (red ink); 'ut sol' in 'Triplum' part on fol. 77v / Sanctus: [Superius]: 'Virgo prudentissima quo progrederis valde rutilans filia sion' (red ink); 'Tenor': 'Virgo prudentissima quasi aurora' (red ink) / Pleni: [Superius]: 'Valde rutilans filia sion' (red ink) / 'Tenor' on fol. 81r: 'pulchra ut luna' (red ink) / Osanna: [Superius] and 'Tenor': 'Pulcra ut luna' (red ink) / Benedictus: [Superius]: 'Tota formosa et suavis es' (red ink) / Osanna: 'Tenor': 'Electa ut sol' (red ink) / Agnus dei: 'Tenor': 'Virgo prude[n]tissima quo progrederis quasi aurora valde rutilans' (red ink)

V-CVbav-ms-Capp.Sist.45: Composer name in ms (index) and in ms = 'Ysaac' / Title as in ms (index) = 'Patre[m] supra virgo prudentissima' / Credo only in this source