Yesterday (September 4th) Mick Jagger tweeted footage of him at home laying down harmonica tracks through his computer to a new song, with the caption: "Harmonica playing on new tunes!" It remains unclear whether he's recording the part for a new solo project or the Rolling Stones' new album -- although as the 2001 TV special Being Mick showed, Jagger is know to lay down tracks away from the studio in the comfort of his own home.

The Rolling Stones were actually recording a new album when the December 2015 sessions morphed into the blues tracks that made up 2016's Blue & Lonesome. Stones producer Don Was maintains that there is ample original material already in the can: "It's really too early to . . . how many songs that we've actually recorded will make a record in the future. Y'know, we cut 30 to get at least 15. So, there's all kinds of stuff. And that's why I say I couldn't even tell you what's going to stand the test of time, and very little of it has gone past the initial tracking date."

AUDIO: RON WOOD ON RECENT ROLLING STONES SESSIONS
AUDIO: DON WAS ON STATUS OF ORIGINAL ROLLING STONES ALBUM