Mark Ronson has said that he is working with Sean Lennon's Ghost Of A Saber Toothed Tiger project, which involves the son-of-John-and-Yoko and his girlfriend Charlotte Kemp Muhl. Ronson will play bass and produce a number of songs for the band, and apparently told The Daily Star: “It's a '60s psych thing, quite Brazilian, with Sean and his girlfriend singing in unison”.