Pianist Frederic Chiu.By Greg StepanichBOCA RATON -- When an orchestra wants to introduce its audience to unfamiliar repertoire, the time-honored pattern is usually to offer only one such piece and leave the rest to the workhorses.But on Sunday afternoon at the Roberts Theater, the Boca Raton Symphonia made the case for two overlooked, rarely played works, and those arguments … [Read more...]