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Kelsey Grammer launched a new TV series, “Boss,” last fall.

The program features Grammer as the mayor of Chicago, a man who keeps his health problems a secret in order to remain in power.

The former Frasier star is pulling double-duty on “Boss,” as both the lead character and one of the executive producers of the series.

Rock fans will recognize the show’s theme song: Robert Plant’s version of the traditional tune, “Satan, Your Kingdom Must Come Down,” as recorded for the Band Of Joy album.

Contactmusic reports Grammer explained how the Plant track found its way onto the program.

"Robert Plant is a friend of mine and an acquaintance,” said Grammer, “and we had drinks one night in New York City, and I had just seen his concert with the Band of Joy that he's been doing, and he said, 'You know, Satan, Your Kingdom Must Come Down is a great song'. I said, 'Yeah, that is a great song.'”

The conversation with the Led Zeppelin legend inspired Kelsey to use the song for the program.

"Actually, I fought for it,” says Grammer. “I think it's remarkable as a piece to open the show, and I think it does foretell a little bit. It also misleads a little bit. It leaves a mystery open, and I like the way it feels. It's a great performance."

The second season of “Boss” starts Friday on Starz.

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