NASHVILLE, Tenn. (AP) - Country music singer Randy Travis was listed in critical condition a day after being hospitalized in Texas with heart problems. A news release from the singer's publicist says the 54-year-old Travis was admitted to the hospital Sunday in Dallas and was in critical condition Monday evening. His publicist, Kirt Webster, says Travis is being treated for viral cardiomyopathy, a heart condition caused by a virus. The Mayo Clinic's website says the disease weakens and enlarges the heart muscle, making it harder for the heart to pump blood and carry it to the rest of the body. It can lead to heart failure. Treatments range from medications and surgically implanted devices to heart transplants.