“I felt strange as soon as the anesthesia started to wear off,” Steenburgen said. “The best way I can describe it is that it just felt like my brain was only music, and that everything anybody said to me became musical. All of my thoughts became musical. Every street sign became musical. I couldn’t get my mind into any other mode.” She wrote hundreds of songs that summer.

How Actress Mary Steenburgen Suddenly Became a Great Songwriter
How Oscar-winning actress Mary Steenburgen came to co-write the euphoric power-ballad that Jessie Buckley performs at end of 'Wild Rose.'
rollingstone.com