The music of Mozart will be played using a small speaker in the baby's isolette. The volume of the music will be set at 10 decibels over background noise, which on previous measurement has been found to be approximately 55 decibels (about the same as a running refrigerator or as the sound of rainfall; 60 decibels is the volume of normal conversation). The volume in the crib will be continuously monitored throughout the hour. As a final recording device, we will also intermittently be using video to capture the reactions of these infants to the music. The study will be done once a week per infant on the same day and at the same time every week