During the nineteenth century, scientists and philosophers were interested in figuring out the origins of language. Some of their theories were pretty fanciful. The pooh-pooh theory, for instance, suggested that human speech came from the instinctive sounds early people made out of frustration and anger. The la-la theory put forth that language was borne of the human need to express music, poetry and love. Both Darwin and a Danish linguist named Otto Jespersen thought that emotion inspired music, which they believed could have been the predecessor to language. Jespersen wrote, "[Love] inspired many of the first songs, and through them was instrumental in bringing about human language."