Mumbai: AR Rahman, music maestro, got a little nostalgic during the launch of his biography 'A.R. Rahman: The Spirit of Music' in Mumbai on Wednesday night.

The book has been penned by renowned writer Nasreen Munni Kabir. Rahman said, “I want to thank Munni for having the patience to sit with me and do this and to have an intension to do this.”

The launch was also graced 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.

Rahman said, “while working on this book withNasreen 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 that time and I didn't have that money. So my mother immediately sold off my sister's jewellery and gave me the money.”

Talking about her experience of writing the book, Kabir said, “The idea of writing this book was actually trying and finding a way of creating a conversational biography that would record a person's thinking, a sweep of one's life up to now and some understanding of his craft and his personality.”

The book took approximately eight years to finish and Kabir said that she witnessed no major changes in Rahman in all these years and he is still very humble.