I don’t think this is “Brain Music” so much as a pair of insane headphones made using people’s hands as drivers and paper as the diaphragm.
.“Brain Music” Electrically Made
MUSIC heard clearly inside the brain although no sound waves were entering the stopped-up ears of the hearer, is a new achievement of the science of electro-acoustics demonstrated by Mr. Sergius P. Grace, assistant vice president of the Bell Telephone Laboratories.