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PHILADELPHIA (AP) _ Folk musician Joan Baez is canceling a performance at a music festival because of her sister's life-threatening cancer.

Baez had been scheduled to appear July 21 at a music festival sponsored by WXPN-FM, the public radio station at the University of Pennsylvania.

The festival, called the Singer Songwriter Weekend, will continue with other performers, including Baez proteges Dave Carter and Tracy Grammer.

The station plans to present a tribute to Baez and have an immense get-well card for her sister, Mimi Farina, which festival participants can sign.