Sibelius

From Alex Ross' The Rest is Noise: Listening to the Twentieth Century, p. 193:

In 1984, the great American avant-garde composer Morton Feldman gave a lecture at the relentlessly up-to-date Summer Courses for New Music in Darmstadt, Germany. "The people who you think are radicals might really be conservatives," Feldman said on that occasion. "The people who you think are conservative might really be radical." And he began to hum the Sibelius Fifth.