Tate Modern’s Blue Rider exhibition chronicles the pioneers of the avant-garde

Just before the advent of WWI, a group of artists came together in Germany to break almost every rule that existed about art — and became the Expressionists. Now, their works are on display at Tate Modern in a collective for the first time in sixty years.
There have been previous shows, one in 1938 of these new artists in direct response to the German government’s rejection of such decadent and un-German art, and later in 1960, but nothing on this scale since.Known as The Blue Rider,