Linda LaFlamme, a songwriter and keyboardist who helped found the San Francisco folk-rock band It’s a Beautiful Day in 1967 and co-wrote the band’s soaring “White Bird,” an enduring anthem of the psychedelic era, died on Oct. 23 in Harrisonburg, Va. She was 85.

She died in a nursing home of vascular dementia, her daughter, Kira LaFlamme Newman, said, adding that Ms. LaFlamme had a stroke in April.