Satellite trucks will be struggling through dense Czech forests in the first week of July, heading to cover a ceremony of extraordinary ambivalence.July 7 marks the 150th birthday of the composer Gustav Mahler (1860-1911), the most influential symphonist after Beethoven and, with Freud and Picasso, one of the makers of modern culture.Mahler, who directed the Vienna Opera and the New York Philharmonic, was born in the highland village of Kalischt and grew up in the military town of Iglau. While the Bohemia- Moravia borderland was a German-speaking region and Mahler was a Jew, relations among Czechs, Germans and different faiths were amicable, so much so that the boy sang in a church choir and picked up much folklore.