 Two musical movements that were dominant during this time were the impressionist beginning around 1890 and the expressionist that started around 1908.It was a period of diverse reactions in challenging and reinterpreting older categories of music, innovations that lead to new ways of organizing and approaching harmonic, melodic, sonic, and rhythmic aspects of music, and changes in aesthetic worldviews in close relation to the larger identifiable period of modernism in the arts of the time.The operative word most associated with it is "innovation".