She is from Amami Å shima and sings in a style particular to that region , with distinctive falsetto effects . Because of this , it is said that her voice has a relaxing effect that has been observed in electroencephalograms taken from the brains of people listening to her singing . Studies have revealed that her particular style of singing , including aspects of traditional Amami - Å shima music , has a relaxing effect that has been observed in electroencephalograms taken from the brains of people listening to her singing .