We're counting down the five most popular songs in the Billboard Magazine Hot 100 pop singles chart, for the week ending July 20, 2013.These are known as the dog days of summer in the United States, when temperatures soar and nobody wants to move quickly.The hit list follows suit, as four of our top five tracks simply stay put.The exception comes in fifth place,where Florida Georgia Line and Nelly decide to re-appear-jumping a slot, with Cruise featuring Nelly.This song has never gone above fourth place on the Hot 100 chart,however, it did top the Billboard Country Singles chart while selling nearly five million downloads.Holding in fourth place is Imagine Dragons with its four million-seller Radioactive.Lead singer Dan Reynolds recently suffered an on-stage accident.
