DEARBORN, Mich. -- It’s the symphony of the automobile; all those chirps and dings your car makes carefully in tune.Sean DeGennaro is a Ford vehicle harmony engineer. He mixes art with science to find just the right sound.Sean DeGennaro CBS News “Should we do a medley, so something like our DNA chimer, ‘dah dah dah,’ or should it be a monotone, like...