"Wazir" co-actors Amitabh Bachchan and Farhan Akhtar went behind the mic together to record a duet track about unusual friendships, for the film.
The 73-year-old shared some of his photographs on his blog, and he can be seen behind the mic.
He has captioned the photograph as: "Song recording for 'Wazir'".
The song, which will reportedly feature in the end credits of the film, is titled "Atrangi yaari".
In some more promotional images, the two actors can be seen having fun while recording the track. Farhan is also seen holding a guitar while singing.
"Wazir" is produced by Vidhu Vinod Chopra and directed by Bejoy Nambiar.