Adele: "I never get angry, but I was ready to murder. I went in crying and stuff, and said, 'Let's write a ballad'. "And [producer Paul Epworth] was like, 'Absolutely not! I want to write a fierce tune. [Be a] bitch about it'." She added: "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. And so 'Rolling In The Deep" was born."