People have liked the songs of ‘Sanju’ and each one of them has a different style. The Ruby Ruby song has been composed by AR Rahman and its the first time that Rahman has composed for director Raju Hirani.
Checkout the Ruby Ruby song from Sanju, composed by AR Rahman, and lyrics by Irshad Kamil. The singers are Shashwat Singh & Poorvi Koutish.
I would recommend that you listen to the song 2-3 times, because like any other Rahman song, you will say ‘what is this’ the first time, you will say “its good” the second time, and by the third time you will be addicted to the song (the song is played after Ranbir’s breakup with Sonam Kapoor, when Ranbir is totally under the influence of drugs).
In the past Ranbir kapoor and A. R. Rahman collaborated together in the movie Rockstar (2011).