Tonus peregrinus (Lat.: ‘wandering tone’, ‘frolicsome tone’)
(Lat.: ‘wandering tone’, ‘frolicsome tone’)
The late medieval name for one of the ‘irregular’ psalm tones, that is, one whose tenor, or recitation tone, changes in pitch after the mediation (in this case from a to g). It takes its name either from this characteristic or from its association with Psalm cxiii, In exitu Israel de Aegypto...