Italian to English Art/Literary Music composition

Hi everyone,

I'm translating some rules for a composition competition and am hesitating over the term "motto" in the following sentence:

"Ogni partitura dovrà essere contrassegnata da un motto e accompagnata da busta chiusa, identificata dallo stesso motto, contenente:"

To my mind, it would be more usual to mark a score with a title than a motto. Do you think this really means "motto" in the literal sense? I'm a musician but not a composer - perhaps composers do use "mottos" that I'm unaware of.

FYI, I have translated the sentence for the moment as "The title of the work must be marked on each score and on an accompanying sealed envelope containing the candidate's:"