NASHVILLE (Reuters) - Country singer Alan Jackson is known for telling true-to-life tales but he says a song about his wife's battle with cancer, "When I Saw You Leaving (For Nicey)," was tougher than most. In fact, he admits it was the hardest tune he's ever had to record. The heartfelt song about Denise, his wife of 30 years, is the closing track on Jackson's newly released album "Thirty Miles West" and it keeps with the country music tradition of writing about the realities of life. ...