Binaural Sound for Remimazolam Maintenance

This study is testing whether playing binaural beats (a type of sound therapy through headphones) during general anesthesia can reduce how much of the sedative drug remimazolam patients need during surgery. **You may be eligible if...** - You are between 20 and 60 years old and scheduled for surgery requiring general anesthesia - Your general health is relatively good (ASA classification 1 or 2, meaning no major systemic illness) - Your ideal body weight is between 50 and 80 kg **You may NOT be eligible if...** - You have a hearing disability - You have used opioids or sedatives in the past week - You are dependent on alcohol or drugs - You are allergic to remimazolam or remifentanil - You have heart rhythm problems (arrhythmia) or cardiovascular disease Talk to your doctor to see if this trial is right for you.