In relation to music, the Golden Age covers figures inspired by Danish romantic nationalism including J. P. E. Hartmann, Hans Christian Lumbye, Niels W. Gade and the ballet master August Bournonville. Literature centred on Romantic thinking, introduced in 1802 by the Norwegian-German philosopher Henrik Steffens. Key contributors were Adam Oehlenschläger, Bernhard Severin Ingemann, N. F. S. Grundtvig and, last but not least, Hans Christian Andersen, the proponent of the modern fairytale. Søren Kierkegaard furthered philosophy while Hans Christian Ørsted achieved fundamental progress in science. The Golden Age thus had a profound effect not only on life in Denmark but, with time, on the international front too.