Swedish country singer-songwriter TJ Leonard topped the airplay charts in 2016 with his single release, “The River.” That song followed his US debut, the ballad, “Remember Those Times,” another Top 10 chart single. His 2017 international hit, “Up On That Hill” received airplay on more than 600 stations, followed by a self-promoted single, “Takin’ You For Granted,” that earned TJ …