I think the enunciation of the chorus would be different if the word was "denser." If you listen carefully, Brandon is singing a higher pitched "annn," not a lower "ehhh" that would exist if the word was "dense" instead of "dance." There's probably a more technical way to describe that, but I'm not a music expert.
I think lostfanatic84 makes a very good point, too.
I think the enunciation of the chorus would be different if the word was "denser." If you listen carefully, Brandon is singing a higher pitched "annn," not a lower "ehhh" that would exist if the word was "dense" instead of "dance." There's probably a more technical way to describe that, but I'm not a music expert.
I think lostfanatic84 makes a very good point, too.