That's actually one of the songs that's mentioned, as well as Oops I Did It Again by Britney and Hit Me Baby One More Time Even more recently, Shake it Off by

That's actually one of the songs that's mentioned, as well as Oops I Did It Again by Britney and Hit Me Baby One More Time Even more recently, Shake it Off by Taylor Swift. Somewhat along the same lines, I was watching the Get Back documentary on the Beatles and the number of songs they write by effectively scatting and then filling in the words that were their big hits is amazing. Again they're writing to fit the tune, then in filling the words based on a general theme. It's very different than the songs they write where you can tell someone's sat down and written the words first.