The first link you posted states “Garth Brooks, who is the best-selling solo artist in the history of recorded music”
…but I don’t have a dog in this race, record companies always inflate sales numbers anyways and any figures are, especially before Soundscan, notoriously untrustworthy. My general point stands though; Garth Brooks is in an Elite Club of massive artists. Despite all that I still couldn’t name a single one of his many, many monster hits without looking it up first. So there’s that.