According to Billboard, four hit Universal Music Group (UMG) titles (Eminem's Kamikaze, Lil Wayne's Tha Carter V, Lady Gaga and Bradley Cooper's A Star Is Born soundtrack and Greta Van Fleet's Anthem of the Peaceful Army) have surprised everyone when the CD versions of those titles quickly sold out. In some cases, the CD versions of the titles weren't even in stores on their release dates. The reason for that happening is a combination of factors ranging from the happy accident of unexpecte