What is another word for "overture"?

Roget's Thesaurus (1911) lists these synonyms for "overture": about, antecedent, avant-courier, bellwether, bid, bribe, candidate, candidature, come, dawn, disengaged, exordium, feet, for, foreboding, forerunner, foreword, forward, frontispiece, gift, give, groundwork, harbinger, hawk, heading, herald, hire, hold, inaugural, introduction, introductory, invitation, invite, lay, leader, let, make, market, motion, move.