In May 2017, an exhibition of the International Mozarteum Foundation's collection, Nannerl & Wolfgang took place at the Dai-ichi Life Head Office, and at its lobby, a recital, Ima Yomigaeru Mozart's Hibiki, or a revival of Mozart's original sound, was held. The exhibition had rare and authentic items related to Mozart and Nannerl, such as Mozart's first small violin for children, his concert violin during his years as a court musician, and his original scores and letters. At the concert, his music was played with these two violins which replicated the sound of his time. Kawasaki and Salzburg Cities Friendship Concert was also held with the corporation of Salzburg's sister city, Kawasaki, and audience enjoyed the great harmony of these violins and a piano.