Even in KDE, the JuK media player/tagger (which is actually the semi-official app) is much closer in appearance to Rhythmbox than Amarok. https://www.kde.org/applications/multimedia/juk/

On the other hand I've not been having a lot of success maintaining JuK recently, but there's better-maintained apps like Tomahawk http://www.tomahawk-player.org/ and Cantata (https://code.google.com/p/cantata/, screenshots at http://i1-linux.softpedia-static.com/screenshots/Cantata_2.p...)