anonymous

Cantus is very close to the Cantus parts of the two pieces in the Odhecaton called "Jay pris amours", but the other parts are different. The Bassus is a the most challenging line to play.

Fallows in DIAMM facsimile edition suggests signum may indicate repeat of final section.

Simple and pretty.

I don't know what the curly symbol over each note in the second section means. It looks rather like the fermata/corona used at the end of other phrases, only without the dot. But I can't tell from context what that would mean when applied to every note in a phrase.

The repeat structure also isn't  clear. My guess is:

(ABCC)x AB

That is, AB is the 'chorus', CC is the 'verse'; repeat as many times as needed for the words, then finish with a final 'chorus'.