Missa cuiusvis toni

Missa Cuiusvis Toni (lit. “Mass in any mode”) is a four-part[1] musical setting of the Ordinary of the Mass by the 15th-century composer Johannes Ockeghem. It is found in late-century manuscripts, including the Chigi codex (c. 1498–1508),[2] and was published in 1539,[3] 42 years after the composer's death in 1497.

The work's name reflects the fact that it may be sung in any of the Dorian, Phrygian, Lydian or Mixolydian modes. This is made possible by writing the music without clefs or key signatures, allowing the singers to assume those suited to the chosen mode.[4] This unusual and complex idea has led the musicologist Fabrice Fitch to describe the mass as "the work chiefly responsible for Ockeghem's reputation as an artful pedant".[5]

Although Leeman L. Perkins describes the Missa Cuiusvis Toni as "not unduly complex in its contrapuntal style",[6] to compose a work to be singable in any of the four modes is a considerable technical challenge, because the cadences suitable for the Phrygian mode are unsuitable for the other modes, and vice versa.[5] Ockeghem's solution is to write cadences that today would be called plagal cadences.[4][note 1] According to the musicologist Richard Turbet, this makes the Mass easiest to sing in the Phrygian mode and successively more difficult in the Misolydian, Lydian and Dorian modes.[7] Both Turbet and Fitch believe that the work was conceived for the Phrygian mode and then adapted for the other modes.[7][5]

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