For many people, a stay in hospital can be associated with stress and anxiety, especially after surgery. In order to potentially make the stay more pleasant for patients in future, the investigators are conducting a study to investigate the use of natural sounds to promote relaxation. Participation in this study usually lasts until 3 days after the operation in hospital. If the participants decide to take part, the participants will be randomly assigned to one of two groups: The intervention group or the control group. In the intervention group, the participants will listen to different natural sounds twice a day. In the control group, the participants will not receive any nature sounds. During the stay, the participants will be given two questionnaires to fill in about how you feel. Participants assigned to the intervention group will additionallyreceive a short telephone interview 14 days after the operation.

Inclusion Criteria:

1. duly completed declaration of consent
2. the age of the patient is at least 18 years
3. only patients undergoing orthopaedic surgery

Exclusion Criteria:

1. deafness
2. severe cognitive impairment
3. chronic pain patient
4. pain catheter insertion during the trial period
5. psychiatric disorders (e.g. anxiety disorders, depression, post-traumatic stress disorder, ...)
6. severe postoperative complications
7. no consent to participate