Perhaps in few places on earth is music transforming the lives of a new generation more than in this remote low-land section of South America. The biennial baroque festival, which wrapped up last week, draws artists from across the globe who perform a repertoire of classical music that always includes at least one piece from the impressive, sacred archive, begun by the missionaries in the 17th century. It has spurred many of the region’s kids to gravitate toward the world of Bach and base clefs. In recent years, some 2,500 youths from area towns, many of them indigenous, have enrolled in music schools, choruses, and orchestras.”