Crossing the color line. In the twentieth century Russian music became a standoff between revolution and counter-revolution, the irony being that the White Russian composers who fled the Bolsheviks were the true revolutionaries while the Reds who stayed to endure Soviet rule were forced to toe the line of backward-looking conservatism. But the music isn't easily color-coded. Vladimir Jurowski led a concert of neoclassical Stravinsky and romantic Prokofiev that betrayed almost no revolutionary instincts, ending with the painful wail of the Shostakovich Sixth Symphony, whose Soviet credentials were never pure enough to satisfy the apparatchiks of the Composers Union.