Study aim: Effects of selected music-therapy on anxiety severity quantity and some indicators physiological of patients acute respiratory failure covid-19 undergoing non-invasive mechanical ventilation Design: Clinical trial with parallel control group, randomized, single center trial, Sample size 90 people (3 groups of 30 people) . Settings and conduct: Babol Rohani Hospital Participants/Inclusion and exclusion criteria: Patients with acute respiratory failure with Covid-19; Connection to non-invasive mechanical ventilation using face or nose-mouth masks; Awareness to the extent that there is the ability to communicate and answer questions; Interested in listening to music; Stable hemodynamic status without the use of vasoactive drugs; 24 hours have passed since admission to the ICU; Positional anxiety score should be 40 and higher. Intervention groups: Intervention group 1: For each patient under non-invasive mask ventilation, he chooses 5 types of non-verbal soothing music based on his taste and plays for 20 minutes in the evening, using a headphone when no intervention is performed. Before and after the music is over, the physiological condition and vital signs and severity of the situational anxiety are measured again. Intervention group 2: For 20 minutes, a headphone is inserted when no care or treatment intervention is performed for the patient. but the player is turned off and nothing is played to the patient. Control group: The same routine interventions are performed and no additional interventions are performed. Main outcome variables: Illness severity; Duration of admission to the ICU; The severity of anxiety.