Ruby Ruby

• Scroll.in : Composed by AR Rahman, Ruby Ruby, the third single from Rajkumar Hirani’s Sanju, echoes the classic Taal song Ramta Jogi in more ways than one – the heavy bass guitars, the languid but thumping beat, and the additional percussion reminiscent of Sivamani’s most energetic works with the composer.[3]
• The Indian Express : The song grows on the listener with repeat hearings which is the case with most Rahman songs. With these three songs, one can certainly gauge that the Sanju album will have a track for every mood.[4]
• Cinestan: AR Rahman written all over it. The Ruby Ruby song has an entrancing rhythm that captures the wild, pulsing beats of an artist in search of his muse.'Ruby Ruby' sets the rhythm template with its combination of electric and bass guitars. The signature element sets up the slow, trance-like tempo of the song before Singh's husky vocals fade in. The song is hoisted on the back of some subtle and effective percussions that back up the trippy vocals. Koutish's voice brings in a haunting facet to the composition, contributing to the trance-like feel of the song.[5]

The song belongs to a completely different space and has the hints of pop in it.  The video of  Ruby Ruby depicts Sanju's 'quest for love as he lets his imagination run wild[6]

Song starts with Rahman's music, high bass over guitar tune, & then sanju (Ranbir Kapoor) says "Har Drug Addict Koi Na Koi Bahana Khojta Hai Drugs Wapas Shuru Karne Ke Liye ,Mera Bahana Ruby Thi" (transl.  "Every Drug Addict Finds An Excuse To Start Again, My Excuse Was Ruby")

Ruby Ruby song has crossed almost 10 Million views on YouTube[7][8][9]

Producer, Composer & SongWriter

• A.R. Rahman

Lyrics

• Irshad Kamil

Performer(s)

Singers used by A. R. Rahman for this song -

• Shashwat Singh
• Poorvi Koutish

Musicians

• Arranged By : A.R. Rahman
• Bass: Keba Jeremiah
• Guitar: Keba Jeremiah & Chris Jason
• Rhythm & Percussions: Raja & Kumar
• Sunshine Orchestra conducted by: VJ Srinivasamurthy

Sound Engineer

• Additional Programming: Ishaan Chhabra
• Mixed by: Ishaan Chhabra & Deepak P A Mastered by: Suresh Permal
• Sound Engineers at Panchathan Record Inn (Chennai): Suresh Permal, Ishaan Chhabra, Santhosh Dhayanidhi, TR Krishna Chetan, Karthik Sekaran, Jerry Vincent, Kumaran Sivamani, Kaashif Rafiq, Pawan Chilamkurthi
• Sound Engineers at AR Studios (Mumbai): R Nitish Kumar, Dilshaad Shaikh
• Sound Engineers at AM Studios (Chennai): S.Sivakumar, Pradeep Menon, Kannan Ganpat, Manoj
• Musicians Fixer: R Samidurai
• Musician Coordinators: Vijay Iyer, Noel James, TM Faizuddin, Abdul Haiyum[10]