Synthetic Waltzes (1925) is a charming legacy of those years. A stylized society waltz, it is full of subtle misbehavior, such as at the opening and conclusion, where Thomson creates the impression of two waltz tempos heard simultaneously. Other works of this period, especially his Gertrude Stein song settings, display a serious whimsy that time has not tarnished. A third opera, Lord Byron, occupied much of there making 1960s. From the later 1970s, Thomson's production tapered off, except in an area that fascinated him throughout his career, the musical "Portraits" of his friends and acquaintances. Despite increasing health problems, he composed sporadically until shortly before his death on 30th September, 1989.