Music maestro AR Rahman got a little nostalgic remembering his old days, during the launch of his biography ‘AR Rahman: The Spirit of Music’ in Mumbai Wednesday night.

The book has been penned by renowned writer Nasreen Munni Kabir.

The launch was also attended by Rahman`s family, including his wife, sister and mother and filmmakers like Mani Ratnam, Ram Gopal Varma, Subhash Ghai, Ashutosh Gowarikar and Imtiaz Ali.

"I want to thank Munni for having the patience to sit with me and do this and to have an intension to do this," Rahman said.

"While working on this book with Munni, I relived many old memories. But the one moment that I relived and can never forget was when I had no money to buy any equipment. I needed four lakh rupees and I didn`t have that money. So my mother immediately sold off my sister`s jewellery and gave me the money," he said.

The book will provide a fascinating window into the world of the ‘Mozart of Madras’, who became the first Indian composer to win two Academy Awards for the 2008 blockbuster ‘Slumdog Millionaire’.