Ut queant laxis or 
Hymnus in Ioannem is a 
hymn to 
Saint John the Baptist written by Paolo Diacono (ca 720 - 799) of 
Italy. It is notable in that the first syllable of each line gave its name to a successive 
note of the 
major scale in 
solfege, as each line begins with the successively higher note. The lyrics are:
-  Ut queant laxis 
-  Resonāre fibris 
-  Mīra gestorum 
-  Famuli tuorum, 
-  Solve polluti 
-  Labii reatum, 
-  Sancte Ioannes.
(So that these your servants may, with all their voice, sing your marvelous (Mī) exploits, clean (Sol) the guilt from our stained lips, O Saint John.)
Ut is now mostly replaced by "do" due to the latter's open sound.
The use of Ut queant laxis to name the notes is usually attributed to Guido of Arezzo.
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