How to write pop songs

From the Washington Post:

“Tempo does not appear to matter,” the USC researchers wrote in the April issue of the Journal of Consumer Psychology. “While every artist strives to create a catchy hook, they may also consider striving to write a coherent song in which the chorus is repeated frequently while utilizing a limited vocabulary.”

...

“people are more likely to engage in a given behavior the less effort it requires.” Which basically means this: Human brains get really jazzed about things that are easy to grasp.

Seems pretty simple, really.