It was hard to write exactly what I'm getting after in the question.
In certain genres like trap (a sub-genre of EDM) people say that the speed of those beats are in the 110 and higher range. Isn't the speed of the beat kinda determined by the placement of the snare? If so, that would make any sort of trap songs in the 55 - 70 range (half of the speed). When I think about genres that are higher than 100 I think about house, soca, etc.
So, like my title asks, how do you determine the beat of a song?