What makes a great country song? Well, if David Allan Coe is to be believed, the songs require a few things: mama, trains, trucks, prison or gettin' drunk. There's got to be more to it than that, though, right? Like, at least five more things. Country music draws on the same themes so often that it's almost a caricature of itself. Our team of statisticians tackled this quandary and have drummed up a list of the biggest tropes in country music. Hop off your tractors, y'all -- the corn harvest can wait. It's time for some learnin'.