Joseph Nunes at the University of South Carolina looked into what makes a song commercially successful in a paper published last year in the Journal of Consumer Psychology.
"Once you got on the hot 100, the more you repeated the chorus, the more word repetition, the less complex the song, the better it did," Nunes told NPR earlier this year.
In fact, for each extra repetition of the chorus "a song's likelihood of making it to Number One, as opposed to staying at the bottom of the Billboard chart, increases by 14.5 percent," Nunes and his co-authors wrote. There is a limit, though. Nunes and his colleagues saw a "ceiling affect", above which more repetitions harmed, instead of helped, a song's chances.