In the remake of a "A Star Is Born," director and star Bradley Cooper uses a voice that's so deep and gravelly, well, it sounds like Sam Elliott's signature sound.

"It was weird," said Elliott about Cooper's movie voice at the Los Angeles premiere of the drama Monday night. "It was good."

Cooper changes the way he talks and sings (yes, that's Cooper's vocals) to play Jackson Maine, a touring musician who discovers the talented Ally (Lady Gaga). Jackson performs with real band Lukas Nelson & Promise of the Real in the movie, and plays original songs written by Cooper, Gaga, Nelson and others.

After writing music and evolving his character's sound, Cooper ultimately wound up sounding just like a certain mustachioed actor from "The Big Lebowski" and "The Ranch."

In the meantime, Cooper rewrote his script to include an older brother, and the idea that Jackson stole this character's voice.

Of course, Elliott had to play the brother role.

"He did establish the voice before Sam Elliott was going to be in the movie, and then he had to go convince Sam Elliott to be in the movie," said producer Lynette Howell Taylor.

Fortunately, that meeting with Elliott went well.

"I went to meet Bradley in his home, I’d never met him before. I spent a couple hours there talking with him and one of the things he did while I was there, he played this tape of him and his voice coach. And he was sounding a lot like me," Elliott said.

"I didn’t have any tips at all, he already had it down."

From TIFF:Lady Gaga cries over 'A Star is Born' – and Metallica inspired part of the movie?