By Denny Dyroff, Entertainment Editor, The Times The Crossing If you go to Bowman’s Hill Wildflower Preserve in New Hope this weekend, you just might hear trees sing – although you’re more likely to hear singing by a choir. But if you tune in spiritually, you probably will be able to hear both human and arboreal singing. On October 3 and 4, GRAMMY-winning new-music choir The Crossing, led...