Claudia Roth Pierpont has a great review-essay in the New Yorker about Duke Ellington. The final paragraph relates a story I'd never heard:
Two years before Ellington died, in 1972, Yale University held a gathering of leading black jazz musicians in order to raise money for a department of African-American music. Aside from Ellington, the musicians who came for three days of concerts, jam sessions, and workshops included Eubie Blake, Noble Sissle, Dizzy Gillespie, Charles Mingus, Max Roach, Mary Lou Williams, and Willie (the Lion) Smith. During a performance by a Gillespie-led sextet, someone evidently unhappy with this presence on campus called in a bomb threat. The police attempted to clear the building, but Mingus refused to leave, urging the officers to get all the others out but adamantly remaining onstage with his bass. “Racism planted that bomb, but racism ain’t strong enough to kill this music,” he was heard telling the police captain. (And very few people successfully argued with Mingus.) “If I’m going to die, I’m ready. But I’m going out playing ‘Sophisticated Lady.’ ” Once outside, Gillespie and his group set up again. But coming from inside was the sound of Mingus intently playing Ellington’s dreamy thirties hit, which, that day, became a protest song, as the performance just kept going on and on and getting hotter. In the street, Ellington stood in the waiting crowd just beyond the theatre’s open doors, smiling.