If there was one thing that Jac Schaeffer always knew was going to be part of the witches’ brew that became “Agatha All Along,” it was music. The showrunner had a lot of different ideas on what form that could take, but in the end, it became “The Ballad of the Witches’ Road” — and crafting the song was a delicate process.

Of course, Schaeffer knew that songwriters Bobby Lopez and Kristen Anderson-Lopez were the people she needed to call first. The trio had previously worked together on “WandaVision,” Marvel’s first series on Disney+, which also happened to introduce Kathryn Hahn’s Agatha Harkness. They did so with another hit song called “Agatha All Along,” which earned a Grammy nomination.

But “The Ballad of the Witches’ Road” required a whole lot more lore in its lyrics.

“When w

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