Meaning of tonus peregrinus in music
The **tonus peregrinus**, also known as the wandering tone or ninth tone , is a psalm tone used in Gregorian chant. It is characterized by having different reciting notes in the first and second halves of a verse. Specifically, the tenor note in the first half is usually a tone higher than the tenor note in the second half.
The name *tonus peregrinus* means "wandering tone" which refers to the melody wandering between two reciting notes. This distinguishes it from the other eight psalm tones which have a single reciting note throughout the verse.
The tonus peregrinus existed before the eight original church modes were established. Later, it became associated with the ninth mode , known as the Aeolian mode.
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