 In 1881 he founded the world's first open-air museum, at Bygdøy, located next to his summer residence near Oslo (back then known as Christiania).In 1885 he published his "Address to the Academy of Music", and a translation of one of his essays on music appeared in "Literature" in May 1900.He had a valuable collection of printed and manuscript music, which was readily accessible to the historical student of music.