“While churning the butter, mother Yashoda was singing about the childhood activities of Krishna. It was formerly a custom that if one wanted to remember something constantly, he would transform it into poetry or have this done by a professional poet. It appears that mother Yashoda did not want to forget Krishna’s activities at any time.” (Shrila Prabhupada, Shrimad Bhagavatam, 10.9.1-2 Purport)