Linda Ronstadt (search) and Carole King (search) will sing the praises of Democratic presidential candidate John Kerry at an event in south Tucson.

They also plan to register voters and encourage early voting at Sunday's event.

King and Ronstadt, a Tucson native, will discuss why they support Kerry's positions on education, health care and the environment, Natalie Luna, spokeswoman for Rep. Raul Grijalva, D-Ariz, said this week.

Ronstadt praised documentary filmmaker Michael Moore at a concert in Las Vegas in July, causing some audience members to storm out. Moore's latest film, "Fahrenheit 9/11," is critical of the Bush administration.

King, known for songs including "It's too Late" and "You've Got a Friend," has campaigned for Kerry in 30 states since January.