Adele was "ready to murder" when producing her hit album 21.

The British songstress released the award-winning record in early 2011. It is famously based on the star's heart-breaking split from her long-term boyfriend.

Adele teamed up with producer Paul Epworth to create the record and says although she was initially unsure of the collaboration, she was glad the music mogul brought out the best in her raw emotions. She is particularly happy with the way her song Rolling in the Deep worked out.

"I never get angry, but I was ready to murder. I went in crying and stuff, and said, 'Let's write a ballad.' And he was like, 'Absolutely not! I want to write a fierce tune,'" she said in her biography, according to British newspaper The Independent.

"When I'm about to get angry in my heart, I can really feel my blood flowing around my body... And I kept going, 'Feel my heartbeat Paul!'

"And the beat of the song was my heartbeat... It just built and built."

Adele has previously revealed she is grateful for the pain her ex-beau caused her during their break-up, as it inspired some of her greatest work.

The 23-year-old star channeled the heartache she was feeling to create to critically-acclaimed second album.

"He made me an adult. He put me on the road that I'm travelling on," she said.

Adele's new biography is called Someone Like Adele, by Caroline Sanderson.