Joaquin Phoenix working on an album with U.K. band The Charlatans

"Once he learned guitar he found that he had quite a lot of demons inside himself that he wanted to expel through music," the band's frontman, Tim Burgess, told Billboard.

"All the tracks that me and [Charlatans manager] Alan [McGee] worked with him on were brilliant," said Burgess. "But he just kept scrapping everything or re-doing everything."

The album does not have a release date, but "I'm trying to get Alan to force him to put it out," Burgess said.

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