Singh said while his entry into politics was "accidental", Pranab Mukherjee was a politician by choice and is one of the greatest politicians living in our country.
"It is absolutely (an account of) how I looked at men and matters as an active political participant", he added.
Incidentally, Mukherjee, who was the Finance Minister in 1982, had appointed Manmohan Singh as the Governor of the Reserve Bank of India. His autobiography is titled Coalition Years 1996 to 2012 and released today at the Nehru Memorial Museum Library, Delhi.
Sonia's decision came as a surprise for many in the party and Opposition as she chose a junior Manmohan Singh over more experienced Pranab Mukherjee.
He appreciated the idea of the publishers to get the book unveiled in the presence of major coalition partners of the Congress-led United Progressive Alliance (UPA) that ruled from 2004 to 2014 under the premiership of Manmohan Singh. He said running the coalition government seemed hard but everything worked out smoothly.
"So before the elections, we have got this book on coalition governments which may come handy", he said.
The former prime minister described Mukherjee as the "most distinguished living parliamentarian and Congressman", whom everyone in the party looked up to for discussing and resolving ticklish and hard issues.
Manmohan Singh during the launch also mentioned that this appointment did not impact their relations.
"He is a politician by choice and it comes naturally to him. I became a politician by accident when P V Narasimha Rao asked me to become the finance minister", he said.
Yechury said Pranab Mukherjee has an "elephant-like memory", remark that prompted Sonia Gandhi to quip he had the memory of "two elephants".