Ut, Re, Mi, Fa, Sol, LA, Si- Ut was later changed to Do, and Si was changed to Ti.
The Latin hymn was called Ut Queant Laxis- a hymn of blessing to St. John. The text is as follows:
"Ut queant laxis, Resonare fibris, Mira gestorum, Famuli tuorum, Solve polluti, Labii reatum, Sancte Johannes"
I shared an interactive CDROM of this interesting story with our first and 1/2 MA classes this week. They really enjoyed learning about Guido, his music, and his passion to write it down.