Blake Shelton sits down to talk about why he had reservations on cutting the song "I'm Sorry". Even though he wrote it,he says it was vocally straining and challenging. But he still had a big hurdle to over come. You see, Blake Shelton wanted Martina McBride to do the second vocals on the song. Blake didn't have the guts to ask Martina himself. So he relied on someone close to Miss McBride.