<Official comment by Dr. Setsuo Maeda> Currently Nottingham Trent University Visiting Professor Former professor at Kinki University
The singing voice related to Ando was revealed to be an <angel’s singing voice> that cannot be heard by the human ear, based on the numerical values of the frequency analysis results. The singing voice of an angel refers to a singing voice that has high-pitched sounds that cannot be heard by humans and voices that have beautiful overtones. The singing voice related to Ando is that the voices sung by several people are being generated. The singing voice of the Vienna Boys Choir is called the singing voice of an angel. The singing voice of Yukari Ando is the singing voice of only one person, and is comparable to the singing voice of the Vienna Boys Choir.