He Wrote Michael Jackson’s ‘Human Nature’ and Has 2 More in the Vault

After more than four decades, Steve Porcaro is still amazed that his song ended up on the biggest-selling album of all time.

In 1982, when he was a keyboardist in Toto — the band of studio insiders that dominated rock radio with sleekly crafted hits like “Africa” and “Hold the Line” — Porcaro was tinkering with a new tune, a mid-tempo ballad inspired by his attempt to comfort his young daughter after a playground quarrel. The rest of the group wasn’t into it.

But Porcaro kept working on the song at the studio of his Toto bandmate David Paich, the group’s primary songwriter, who was pitching Quincy Jones some rock-oriented material for Michael Jackson’s next album. One day, they put two of Paich’s songs on a cassette for Jones; on the flip side was a rough demo of Porcaro’s ballad.

When Jones heard that tape, it was Porcaro’s tune that entranced him, with its mellow mood and searching chorus: “Why, why?/Tell her that it’s human nature.” With lyrics added by John Bettis, “Human Nature” became a key cut on “Thriller,” which sold 34 million copies in the United States alone and transformed pop music in the 1980s.

“It was a total, absolute fluke,” Porcaro recalled in a recent video interview from his home studio in Los Angeles, which is lined with gold and platinum albums by Toto and Jackson.

“Human Nature” is now part of the latest in the music industry’s big catalog transactions. This week, Porcaro signed a deal, estimated in the low eight figures, to sell the rights to his music to the Jackson estate and the independent music company Primary Wave, they confirmed.