Tonus peregrinus


Tonus peregrinus, the wandering tone, or the ninth tone, is a reciting tone in Gregorian chant.
The chant example here is not identified as the tonus peregrinus in the Liber usualis, although it is in Aeolian mode. For the tonus peregrinus in its customary usage for Psalm 113, see LU p. 160.

Characteristics

As a reciting tone the tonus peregrinus does not fit in any of the original eight church modes, because a verse recited in this tone has a different tenor note in the first half of the verse from the second half of the verse. It is this diversion from a single recitation note which gives the name peregrinus, literally "wanders".
Traditionally, the tenor note in the first half of a verse sung according to the tonus peregrinus is a tone higher than the tenor note in the second half of the verse. Also usually the last note of a tonus peregrinus melodic formula is a perfect fifth below the first tenor note.

History

In Gregorian chant the tonus peregrinus existed before the modal system was expanded beyond the eighth mode. Later the ninth tone became associated with the ninth mode, or Aeolian mode, which, in a more modern understanding of harmony, can be equalled with a standard minor mode.
The tonus peregrinus is an exceptional reciting tone in Gregorian chant: there it was most clearly associated with Psalm 113, traditionally sung in vespers. In Lutheranism, the tonus peregrinus is associated with the Magnificat : the traditional setting of Luther's German translation of the Magnificat is a German variant of the tonus peregrinus.

Musical settings

Tonus peregrinus variants appear in: