Johnny Cash’s son told The Guardian that there are several albums worth of unreleased recordings from the Cash vault, specifically the American Recordings sessions with Rick Rubin. “There are a few things that are in the works right now – probably four or five albums if we wanted to release everything,” John Carter Cash said. “There may be three or four albums’ worth of American Recordings stuff, but some of it may never see the light of day.”

Producer Rick Rubin has released two posthumous albums since Cash’s passing in 2003, American V: A Hundred Highways and American VI: Ain’t No Grave and says there may be several more from his and Cash’s American Recordings sessions from the 90s.

Rubin spoke about the possibilities of more releases as well as a follow up to the Unearthed box set released two months after Cash’s death. “We released the work we had been planning to release along with John [Carter Cash] and the idea of the Unearthed box set of outtakes was his idea,” Rubin said. “We will probably put out additional Unearthed material recorded since the last Unearthed box, in keeping with John’s wishes.”

Recently, Out Among the Stars, a posthumous Cash album recorded in the 80s, was released this week and is currently streaming online via The Guardian.