Originally Posted by almauro

Just because something is popular, doesn't make it pop music. For instance Slipnot and the like, could never be "pop" music, eventhough they have good (or did have) record sales. Pop music by nature is catchy and has memorable melodies and choruses. If jazz was ever to become popular, it have to incorporate elements of "pop", thus it would become less jazz and more pop, so consequently it be "pop-jazz", similar to what happens when you cross pop + metal = pop-metal. Bottom line is if jazz ever became pop, many people would question whether it's still jazz.