Theater: In The Sweet, Funny By and By OIL CITY SYMPHONY

In a pennant-festooned high school gymnasium in the imaginary Midwestern town of Oil City, four musicians who grandly call themselves the Oil City Symphony have come together for a reunion concert. There is Mark the pianist and accordionist, a geek with glasses in a white dinner jacket and purple slacks who is also the minister of music at his church; Debbie the drummer, an ex- prom queen in a strapless gown who exchanges one pink pump for a running shoe, the better to thump her bass drum; Mary the violinist, of stern Scandinavian stock, uptight, humorless and "best remembered locally for...