On New Year's Day 1975, Elton John released the single "Philadelphia Freedom." The song was a hit, reaching No. 1 on the Billboard Hot 100, and in 1995 the Recording Industry Association of America certified it platinum, marking more than one million records sold.

John penned the song in homage to his friend Billie Jean King. The singer followed King's career, including her time in 1974 with the Philadelphia Freedoms in the World TeamTennis league. John was such a fan that he would dress in the team's uniform and sit on the bench.

He'd be sitting on the bench screaming, "Come on!" He's a maniac.

So anyway, we're going to a concert of his one night, because I used to go with him a lot. I just remember him in this car, in this shell, in this bubble. He can't go anywhere without five bodyguards. One night he's in the back seat and he goes, "I want to write a song for you." I'm looking at him like he's kidding me for sure. Yeah, right. What is he smoking?

"No, no," he said. "I'm serious. I want to write a song for you"

"You're serious?"

"Yes," he said. "I'm very serious. What are we going to call it?"

He goes like this: Clap-clap-clap. He makes decisions quickly. He's just like, "Go! Take no prisoners!"

"What are we going to call it?" he asks. "What are we going to call it? What are we going to call it?"

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Philadelphia Freedom: The story behind the song