The musician Sting says writer’s block led him back to the hometown he had worked so hard to escape. Wallsend was a shipbuilding center in Northern England, but he was never interested in being a shipwright. The stories of the men and women there called to him though, and they became the basis for his musical The Last Ship. Pioneer Theatre Company opened its production last week, and Thursday, director Karen Azenberg and others join us to talk about the themes of work, identity, and coming home.