[Picker 1965] proposes attribution to La Rue
A-Wn-ms-Mus.Hs.18746-1: Text incipit only: 'Maria m[ate]r gracie' / Title as in ms = 'Fors seullement . Quinque vocum . alleluya'
A-Wn-ms-Mus.Hs.18746-2: Text incipit only: 'Maria m[ate]r gracie' / Title as in ms = 'Fors seullement . Cum quinque' / fol. 52r: inscription: 'clare van diest heft hier gheweest'
A-Wn-ms-Mus.Hs.18746-3: Text incipit only: 'Maria m[ate]r gracie' / Title as in ms = 'Fors seullement . Cum quinque'
A-Wn-ms-Mus.Hs.18746-4: Text incipit only: 'Fors seullement' / 'Canon In subdyapason' / Title as in ms = 'Maria m[ate]r gr[aci]e'
A-Wn-ms-Mus.Hs.18746-5: Text incipit only: 'Maria mater gracie' / Title as in ms = 'Fors seullement Cum quinque [vocum]'
B-Br-ms-228: 'Bassus 2[secundus]': 'Indyapason'
