I found this fascinating quote today:
He plays the guitar, synthesizer, keyboard, piano and harmonium. He educated under Master Dhanraj; founded the rock group Nemesis Avenue; was part of the orchestras of Ramesh Naidu, M.S.Viswanathan; went on world tours with Tabla Master Zakir Hussain, Violin Greats Kunnakudi Vaidyanathan and L.Shankar. He learned Western Classical Music at the Trinity College of Music, London after winning a scholarship. A.R Rahman made record by winning a double Oscar for Best Original Music Score and Best Song (Jai Ho).sukkran, Who is A.R.Rahman - The Oscar Winner, Sep 2009
You should read the whole article.