Sam Anderson has a wonderful profile of Weird Al in The New York Times Magazine. I read through it all this morning, and when Yankovic talks about his writing process, it really jumped out at me:
But it turns out that Weird Al approaches the composition of his music with something like the holy passion of Michelangelo painting the ceiling of the Sistine Chapel. Looking through the “White & Nerdy” file felt like watching a supercomputer crunch through possible chess moves. Every single variable had to be considered, in every single line. The song begins with a simple sentence — “They see me mowing my front lawn” — and even here Yankovic agonized over “lawn” versus “yard” and “my” versus “the.” He sifted through phrases in gradations so small, they were almost invisible: