Veni Creator Spiritus

"Veni Creator Spiritus" (in English: Come, Creator Spirit) is a Christian Hymn written by the German Monk, Teacher and Archbishop Rabanus Maurus in the 9th century.
This hymn is dedicated to Pentecost and sometimes to the Holy Spirit, it is also used when the cardinals enter the Sistine Chapel during the election of the New Pope, for a short time, it was used as the Unofficial Anthem of the First Mexican Empire and the Mexican Provisional Government.