On Sunday, the couple will marry onstage before the Seattle Men's Chorus and Seattle Women's Chorus at Benaroya Hall, home to the Seattle Symphony Orchestra.
Two men who have been together for 23 years will also marry onstage, the two women said.
When Petersen and Lighty tie the knot, the Women's Chorus will be singing from "One Hand, One Heart" from "West Side Story."
As they approach the 36-year mark of being a couple, Petersen observed: "We're just blessed with the people we've met and the opportunities we've had."

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