Joseph Muller was a collector, amateur musician, musicologist, and portraitist. Born of German-Belgian parents in Frankfurt-am-Main, Joseph Muller, who started collecting during his student days, studied violin at the Brussels Conservatory, where, as a student of Alexandre Cornélius, he won first prize in July 1895. But his love of travel led him to a career as a ship's steward. During his many travels he sought out print dealers worldwide, adding to his growing collection. He collected music manuscripts and letters in addition to portraits (not surprisingly he was especially attracted to those of string players). His interest in music and collecting led him to do extensive research, making him an authority on early music and early American music in particular. In 1934 he joined the staff of the Music Division where he was employed until his death. In his 1935 publication "The Star-Spangled Banner : words and music issued between 1814-1864," Muller compiled an annotated and richly illustrated bibliography, tracing variant early publications of the text and tune of the American national anthem. An amateur artist, Muller drew copies of prints and, to a lesser degree, made portraits from life (usually at the back of a concert hall). Some of these drawings are included in the Muller Collection as well. He died at his home in Closter, New Jersey, on May 9, 1939.