one of his favorite bands. ♪ amazing grace how sweet the sound ♪ >> reporter: it was a spirit lifting serenade for the former commander in chief, ordered up by former first lady barbara bush. >> she called us and said that we should cheer the president up, and if the oak ridge boys could all get together and sing him a song or two. >> reporter: for decades, the bush family and the oak ridge boys have been mutual fans. when the call came in, the boys were on vacation, but dropped everything, gathering at the office in only 45 minutes. >> it was great to hear the president's voice in a cheerful mood. >> reporter: mr. bush is fighting complications of bronchitis. an expected three-day stay stretching more than a month. but when the band called his room on friday, number 41 had a request. >> he said he was ready to hear some "elvira."