The level of preoperative anxiety can be assessed by administering different tools .The State-Trait Anxiety Inventory (STAI) , is a widely used tool in the literature, for its handling and the reliability of results . We expect that after administration of a listening session of binaural beats with 4 Hz frequency, the possible effect of relaxation result in a reduction of the level of anxiety measured with STAI scale, that would result in a significant difference between the average value of the submitted subject to treatment and that of control subjects.