Inclusion Criteria:  willing participants who could communicate with a stable clinical condition between 18 and 88 years old with no hearing problems with no previous psychiatric or mental illness undergoing coronary artery bypass surgery for the first time (non-emergency surgery)  Exclusion Criteria:  unstable clinical situation declined to participate, history of Chronic Obstructive Pulmonary Disease (COPD) or Chronic Kidney Failure (CKD) those with post-operative cognitive and neurological complications and severe hemodynamic dysfunction those requiring resternotomy or prolonged mechanical ventilation (more than 24 hours) with complications (pneumonia, atelectasis , pleural effusion, etc.).