What is the difference between a publicist, a manager, and a promoter?

I work for a concert musician where my main job is to make phone calls to various halls, theaters, and auditoriums in order to book performances for him. On my resume I've listed "Personal Assistant" -- but would my responsibilities also fall under a "Publicist," "Assistant... show more I work for a concert musician where my main job is to make phone calls to various halls, theaters, and auditoriums in order to book performances for him. On my resume I've listed "Personal Assistant" -- but would my responsibilities also fall under a "Publicist," "Assistant Manager," or "Promoter" title?
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