According to sources for Variety, the former Beatles star has recorded bass parts for a forthcoming Rolling Stones project helmed by Grammy-winning producer Andrew Watt. Meanwhile, McCartney's former bandmate Ringo Starr has also reportedly been tapped to play on the upcoming album. Sources shared that McCartney's recording sessions for the album took place in Los Angeles in "recent weeks", with production on the project nearing its mixing phase. It is unclear if McCartney and Starr will appear on the same song...