After graduating from Nagoya University in 1974, Shigeru Yoshikawa got a position at the Fifth Research Center, Technical R&D Institute, Defense Ministry, Japan in 1980. He was engaged in research on sonar technology and underwater acoustics. He received a Dr. of Eng. from the Tokyo Institute of Technology in 1985. He was appointed professor of Department of Acoustic Design, Kyushu Institute of Design (currently, Kyushu University) in 1998. His education and research were focused on the acoustics of musical instruments. He was appointed fellow of the Acoustical Society of America in 1999. He retired from Kyushu University in 2015 and came to the present. Keita Arimoto completed his Master’s degree in Design at Kyushu Institute of Design in 2002, focusing on jet behaviors in organ pipes and other air-jet musical instruments. He joined the Yamaha R&D division in 2002. His research activities cover various aspects of sound and music, including musical acoustics, signal processing, and music information retrieval. Takayasu Ebihara completed his Master’s degree in Design at Kyushu University in 2012, focusing on the nonlinearity of hand-stopping techniques in the horn. He joined Yamaha Corporation the same year, working on brass instrument development. Since 2020, he has been engaged in product planning for educational instruments and so on.