The Sacramento Opera presented Giuseppe Verdi's La Traviata to a full house Friday night at the Community Center Theater. From the opening number, the audience was captivated by lead Karen Slack (soprano), who played Violetta Valery, and Alexander Boyer (tenor), who played Alfredo Germont. Conducted by Timm Rolek, the Sacramento Philharmonic Orchestra accompanied the cast in the two-and-a-half-hour performance. Slack and Boyer's voices complemented each other, bringing the dramatic storyline to life. La Traviata follows Valery, a courtesan, and Germont, a respectable young man, as they fall in love and later feel the pain of being torn apart by Alfredo's father, Giorgio Germont, played