She had a string of pop-rock hits in the 1970s, but is best known for the 1972 anthem I Am Woman - which became prominent in the women's liberation movement.
Actress Jamie Lee Curtis shared a clip of Reddy singing her anthem at a Women's March protest in Los Angeles in 2017, part of global rallies which directed anger at US President Donald Trump.
Introducing Helen at the Women's March," she wrote, adding: "Read the lyrics".
She hosted a season of the Helen Reddy Show on NBC TV in 1973, and a year later was awarded a star on the Hollywood Walk of Fame
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