Mili was the last film composed by Sachin Dev Burman, before he went into a near year long coma preceding his death. His last composed song was 'Badi sooni sooni hai', sung by Kishore Kumar
S.D. Burman passed away during the making of this film. R.D. Burman then picked up his father's tunes and helped record the songs. He was given "Grateful Acknowledgements" in the film's opening credits.
The song 'Badi sooni sooni hai' was arranged and recorded by Rahul Dev Burman in his father's absence.
Amitabh and Jaya Bachchan worked in 3 films in 1975 Sholay, Chupke Chupke and Mili.
Abhimaan's background music was used in a few scenes.