“I had my own sort of religious unraveling,” Ament says.

“That was something I felt Jeff would be able to bring.”

One of his biggest challenges was how to juggle the show’s ever-shifting story.

Jeff Ament, Under the Banner of Heaven

Pearl Jam’s Jeff Ament, Andrew Garfield in ‘Under the Banner of Heaven’.Scott Dudelson/Getty Images; Michelle Faye/FX

In fact, Black had to occasionally encourage Ament to embrace a harder, more rock ‘n roll tone.

“Sometimes [Black] was like, ‘I want it to be heavier.

I want it to be more rock.’

“It’s a hard story to tell,” Ament adds ofUnder the Banner of Heaven.

“It’s hard to incorporate so much history in a handful of montages in seven episodes.