Program music particularly flourished in the Romantic era. As it can invoke in the listener a specific experience other than sitting in front of a musician or musicians, it is related to the purely Romantic idea of the Gesamtkunstwerk describing Wagner's Operas as a fusion of many arts (set design, choreography, poetry and so on), although it relies solely on musical aspects to illustrate a multi-faceted artistic concept such as a poem or a painting. Composers believed that the dynamics of sound that were newly possible in the Romantic orchestra of the era allowed them to focus on emotions and other intangible aspects of life much more than during the Baroque or Classical eras.