Missa L'homme armé super voces musicales

The Missa L'homme armé super voces musicales is the first of two settings of the Ordinary of the Mass by Josquin des Prez using the famous L'homme armé tune as their cantus firmus source material (for the other, presumed later, setting see Missa L'homme armé sexti toni). The setting is for four voices. It was the most famous mass Josquin composed, surviving in numerous manuscripts and print editions. The earliest printed collection of music devoted to a single composer, the Misse Josquin published by Ottaviano Petrucci in 1502, begins with this famous work.

Dating of the mass has been controversial, with some scholars proposing a mid-career date, for example during Josquin's Roman period (roughly 1489 to 1495), and other scholars, such as Gustave Reese, arguing for an earlier date, claiming that the contrapuntal complexity the mass shows is more typical of Josquin's early style, and that he simplified his method as he aged. The earliest source containing the mass is the Vatican manuscript CS 197 (c. 1492–1495) In his 1547 Dodekachordon, Heinrich Glarean wrote that Josquin "composed the two L'homme armé masses to show off his skill."

While usually classified as a cantus firmus mass, the use of snatches of the tune in other voices foreshadows the paraphrase technique which Josquin was to use extensively later in works such as the Missa Pange lingua, and which was to become one of the standard methods of writing cyclic masses in the 16th century.

Like most settings of the mass, it is in five sections:

Showing off his contrapuntal virtuosity seems to be Josquin's aim, and the mass is full of mensuration canons, second only to Ockeghem's Missa prolationum, which contains nothing but mensuration canons. In a mensuration canon, each voice sings the same notes, but the length of time each note is sung differs. The opening Kyrie of Josquin's mass contains consecutive mensuration canons based on each phrase of the L'homme armé tune, with the tenor leading each and the other voices entering in turn. The second of the three of Agnus Dei sections is another well-known mensuration canon (see example); this particular canon was famous in the sixteenth century, and often mentioned in theoretical treatises.

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