The seventh note of the scale ( if ) introduced it into the sixteenth century Anselmo of Flanders joining the initials of the words of the last verse of the stanza : Sancte Ioannes . In the XVII the Italian musicologist Giovanni Battista Doni replaced the UT note with DO, taken perhaps from the initial of Dominus (Lord) or perhaps From Doni. And so we have the musical scale : do , re , mi , fa , sun , the , yes.
