Tossed by the waves of the Atlantic Ocean, the small motorboat surges forward. The music pulses on, strongly percussive salsa and rumba, accompanying the dozens of Cuban refugees who are swinging their hips and shoulders rhythmically to the beat. Aboard the motorboat, the music carries the refugees to their dreams. Above, the sun climbs higher; behind, Cuba is vanishing from view; ahead, Miami City at the Florida Peninsula are coming into vie