Crowds are thronging to Jessica Grace Wing’s new musical “Lost” “Ms. Wing’s death so close to the production’s debut — she was said to have finished the musical’s final song just a day before dying — has created an unmistakable sentimental momentum for “Lost,” which is based on the children’s tale “Hansel and Gretel” and has a book and lyrics by Kirk Wood Bromley. Like the Broadway musical “Rent,” which also started in the East Village and whose composer, Jonathan Larson, died just after the show’s final dress rehearsal, “Lost” is selling tickets to those who knew Ms. Wing’s work and those who suddenly want to discover her. “