Sure, most of the people lounging in the bar at Maggiano's in King of Prussia are waiting for a table—"Now seating Joseph, party of four!"—in the cavernous dining room. But the patient patrons don't seem to mind the long wait (sometimes more than two hours at dinner on a Saturday). The comfortable bar area has ample seating, $1 weekday happy-hour appetizers, apple martinis—and Panama Jack, a rotund, chapeaued piano player with a loyal following, a repertoire of bad jokes, and a fondness for requests. When he plays "Piano Man," you'll be singing along, too (205 Mall Boulevard, King of Prussia; 610-992-3333).