"KDE 4 meant (and means) an enormous refactoring of basely all
KDE. Amarok developers decided that was the moment for a new GUI
(Graphical User Interface). At first users, seemed to be happy
about it (they were they beloved Amarok creators), however, as time
passed they truly started hating the new interface, some adapted,
other are still using Amarok 1.4.x, and the majority, completely
migrate to another application."