I made this score for my own study purposes, but it may be useful or interesting for other people as well. My aim was to make apparent the occurrences of the secular song in Ockeghem's Mass, both aurally (by means of timbric differentiation) and visually (by presenting the text of the song at the proper places).

There is evidence that Ockeghem's 'L'homme armé' Mass is older than Dufay's, and thus can be considered the first Mass in the long series of Masses based on this famous song.

In this movement Ockeghem added a rule that the tenor should be sung one octave below the written part, thus making it lower than the bass. In Agnus III he added a flat to the key signature, changing the mode to G-Dorian.
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This transcription follows the vocal score by Dragan Plamenac (1959) available at IMSLP. Dynamics and tempo choices are mine.

See better scores of all my transcriptions of the' L'homme armé' Masses at:
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