How did a Led Zeppelin radio classic soar to No. 1 on a Billboard chart 47 years after its release date? Chalk it up to the hammer of the gods and a well-played movie placement.

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The GRAMMY winners' "Immigrant Song" claimed the top spot on the Hard Rock Digital Song Sales chart thanks to being featured in the Marvel box-office hit Thor: Ragnarok, starring Chris Hemsworth and Cate Blanchett. 

Originally released on 1970's Led Zeppelin III, the hypnotic riff-based tune saw an exponential 977 percent increase in sales to 18,000 units the week ending Nov. 8. Additionally, "Immigrant Song" saw a 133 percent boost to 2.1 million U.S. streams.

Led Zeppelin's 2007 compilation, Mothership, which features "Immigrant Song," jumped from No. 166 to No. 80 on the Billboard 200 on the strength of a 70 percent gain equivalent to 8,000 album units. 

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According to the film's director Taika Waititi, it took nearly two years of planning to secure the rights to the song. 

"When we had the first cut of the trailer and showed Led Zep they understood how perfect the song was for this character," Waititi told Business Insider. "I think it wouldn't have happened if we didn't start the conversation with them really, really early on."

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