George H.W. Bush "continues to improve" -- and is even singing

“President Bush remains in the intensive care unit at Methodist Hospital, where he continues to improve,” family spokesman Jim McGrath said in a statement. “The president is alert and, as always, in good spirits — and his exchanges with doctors and nurses now include singing.”
The statement said that the Bushes, like their doctors, are “cautiously optimistic that the current course of treatment will be effective.” The Bushes thank everyone for their prayers and good wishes, McGrath said.