Compression-tonometric (compression-piezoelectric) test is a study of the sound system of the human body by isolating, amplifying and listening to the tones of the main part of the bones. It is carried out by a doctor - a physiotherapist, orthopedist, surgeon or neurologist. It is done as follows. Members of the group applying to be examined are checked for compliance with the requirements and divided into two groups: main and control. In each of them, several subgroups are distinguished to form differentiated plans. The criteria for determining the initial level are: age, state of the cardiovascular system, musculoskeletal system, gender, the presence of any pathologies in a given age group and subgroup, as well as interest in identifying a certain phenomenon. Tones are determined in the so-called “quiet” sounding distal nail phalanx of the wrist joint according to previously identified musical notes.