Rolling Stone reports that McCartney, who has been traversing the U.S. for the last couple of months on his Out There Tour, has been working on his follow-up to 2012′s Kisses On The Bottom with a cadre of guests, including producers Mark Ronson, Adele hitmaker Paul Epworth, and Giles Martin, son of "fifth Beatle" and producer George Martin.

The album will also feature the son of a Beatle contemporary, producer Ethan Johns, whose father Glyn Johns worked with The Beatles, The Who and The Rolling Stones. The young Johns has also produced a handful of seminal indie records like Ryan Adams' Heartbreaker, the first two Kings Of Leon records, and the last three Laura Marling records. In an interview with RS, Johns said that he and McCartney first started recording a song called "Hosannah" on vintage instruments to analog tape.

"It had an incredible feel," said Johns of the song, "a really evocative piece of music, a very interesting lyric, and the performance was great. Then we started to experiment with it, and I put a bunch of psychedelic strangeness on it. You have fun. 'Oh, try this! Do that!' It's just very inspiring to be around."