In 1965, 25-year-old Nancy Sinatra scored her first No.1 hit with “These Boots are Made for Walkin’,” a bold anthem for female empowerment. Brazen, sassy, and utterly infectious, it was a reintroduction of sorts for the eldest daughter of Frank Sinatra, who had been struggling to find a spotlight of her own amid a changing musical landscape. Suddenly, audiences who had initially brushed off Sinatra as too demure or out-of-touch were paying attention. Written and produced by Oklahoma-born songsmith Lee Hazlewood (with swaggering instrumentals, courtesy of Billy Strange and The Wrecking Crew), the song launched the singer’s career, as well as one of music’s most unlikely, yet compelling, creative partnerships.