Mick Jagger has teamed up with his younger brother Chris for two new duets to mark the 40th anniversary of the Chris’ debut album.

Chris Jagger, who has been performing as a solo act since the 1970s, admits Mick’s 50th anniversary celebrations with the Rolling Stones last year have prompted the younger Jagger to reminisce about his time in the industry and now his new project, Concertina Jack, has been released as a nod to his own milestone.

In a post on his website, Chris Jagger wrote: “I’m not a big one for anniversaries, but in the brew ha ha revolving around The Rolling Stones and 50 years I realized it’s 40 years since my first record came out.”

Mick Jagger has teamed up with his younger brother Chris for two new duets to mark the 40th anniversary of the Chris’ debut album

Concertina Jack features Mick Jagger’s vocals on the title track and another song called Diamonds and Pearls.

Promoting his younger brother’s work on Twitter, Mick Jagger wrote: “My brother Chris Jagger has a new album called Concertina Jack, & I’m singing on the title track.”

The album, Chris Jagger’s ninth studio release, is named after a great uncle who left his family home in the UK to sail to Sydney around 1880.