Even at the age of 70, Sir Paul McCartney refuses to slow down. Despite having released 'Kisses on the Bottom' as recently as this past February, he is reportedly back at work on a new album. It's possible that he may even have two new projects in the pipeline.

Producer Ethan Johns, best known for his work with hitmakers Kings of Leon, recently told NME that he has been recording with McCartney. "It's sounding great," Johns said. "He's still one of the most extraordinary recording talents. There's a song on the record called 'Hosanna' which is absolutely heartbreaking – just Paul and an acoustic guitar. It's gorgeous."

Johns, who called the work, "classic Paul," has already booked two sessions with McCartney and has a third coming in the next few weeks. "I'm not sure what [the plan] is," he continued. "I'm simply a guy in his phone book he calls up every now and again and asks if I want to do something. And you don't say no to McCartney."

This summer, McCartney spent some time in the studio with another in-demand producer, Mark Ronson, who has worked with Adele and Amy Winehouse. McCartney has known Ronson, whose mother was married to Foreigner's Mick Jones, for years, and even saved his life when Ronson was a little boy.

But McCartney doesn't usually work with multiple producers on an album, which fuels speculation about whether or not he has two albums in the works. McCartney is also working to compose music for Bungie, creators of the popular video game series 'Halo,' on their newest game.

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