Quid Quaeritis Viventem Cum Mortuis (Chapel of the Holy [Trinity?], St. Honorat

First light: here is the first image of music... the voices are on facing pages: S[uperius/soprano] and tenor on the versos, alto/bass on the recto (facing page).

The text is simple: "Why seek ye the living among the dead?"  I thought it'd be a good place to start...