I once had Betar music therapy, you have to lie suspended in a sort of spherical structure surrounded by speakers, the brochure says:-
"During the BETAR session,excess bodily stress of all kinds is continually scavenged from the cells, tissues, vessels, organs and bones from the entire body and radiated away as harmless sound waves. BETAR specifically targets internal stress."
It was part of a relaxing girls' spa day, and at the time I was at my "sceptical but wanting to be polite" stage, so I just put up with it. Anyway, it's always good to get a short nap during the day.
Complete bunkum though, if I went again I'd have to tell them. Now that would be a good way of 'scavenging stress out of my bones'. Sheesh!