«Ut queant laxis
[«Para que lassas
ressoem as fibras,
mira os gestos aos
solve a poluição dos
[So that loosened
resound the fibers,
look at the gestures of
solve the pollution of
– Paulus Diaconus (720-799), “Hymnus in Ioannem“, written in Sapphic stanzas.
The first syllable of each hemistich (half line of verse) from Ut queant laxis were used by Guido of Arezzo, in the eleventh century, to name the successive six musical tones. The “si” was added much later, in the 18th century.
The hymn is usually sung on June 24, the Feast of the Nativity of John the Baptist, and is divided into three parts, with:
– “Ut queant laxis” sung at Vespers (18h-21h),
– “Antra deserti teneris sub annis” sung at Matins (0h-3h),
– “O nimis felix, meritique celsi” sung at Lauds (3h-6h).