Inclusion Criteria:  Pediatric patients undergoing tonsillectomy with or without adenoidectomy  Age 4 - 10 years. Sex: Both sexes Patients with ASA classificaion I and II.  Exclusion Criteria:  Declining to give written informed consent. History of allergy to the medications used in the study. psychiatric disorder. ASA classification III-V. Fever ,cough , asthma or upper respiratory tract infection . Anticipated difficult airway . Hearing defect . Neurological disorder. Family history of malignant hyperthermia .