Odetta, the singer whose deep voice wove together the strongest songs of American folk music and the civil rights movement, died on Tuesday at Lenox Hill Hospital in Manhattan. She was 77.

The cause was heart disease, said her manager, Doug Yeager. He added that she had been hoping to sing at Barack Obama’s inauguration.

Odetta sang at coffeehouses and at Carnegie Hall, made highly influential recordings of blues and ballads, and became one of the most widely known folk-music artists of the 1950s and ’60s.