To support a study examining whether and how listening to musical performances in an intensive care unit (ICU) can improve patient recovery and healing. Researchers from Georgetown University Medical Center's Lombardi Arts and Humanities Program and Neurophysiology and Behavior Laboratory will team with the Anesthesiology Unit at MedStar Georgetown University Hospital to test the hypothesis that music can promote healing by altering the mental and physiological profile of ICU patients. Physiologic measures will include blood pressure, respiration rate, pulse rate, ventilation rate and volume, and blood oxygen saturation levels; and salivary measures of cortisol, dopamine, and oxytocin levels.