On his way home from the concert, Perry Mansfield whistled a pleasant melody from an old Stravinsky classic. But then, troubled by his conscience and that of his psychiatrist, he stopped to study the program again. What was that modern symphony? Oh yes, "The Flivver". The music was supposed to have its roots in antiquity when someone started converting the metal wealth of the earth on an assembly line. Those screeching noises were drill presses and lathes and automatic hammers. The syrupy melody