Opera San Antonio is fixated on doomed love this year — after May’s performance of La Bohème, they’ve returned with Giuseppe Verdi’s La Traviata for the fall. Initially a flop, the opera is now considered a staple of the canon, and for good reason. La Traviata brings two star-crossed lovers to the stage: naïve and sweet Alfredo, and the experienced courtesan Violetta. Despite their mismatched social classes and Violetta’s worsening illness, they try to make a life with one another, but social pressures split them asunder. Although La Traviata is more intimate than Verdi’s later, more grandiose works, the score doesn’t skimp on lush, beautiful melodies. Key moments include Violetta’s first-act aria, “Sempre Libera” and Giorgio Germont’s second-act aria “Di Provenza il Mar.” Be sure to pay particular attention to Amanda Woodbury as Violetta — the difficult role is almost hybrid in nature, and some even contend that each act requires a different kind of voice.