Easy

It is really easy to use. The one thing I want is when you want to add a bunch of songs to a playlist, you should be able to click a bunch of videos then add all of those videos at the same time. It can get annoying when you are trying to add a lot of songs but you have to individually add a song to a playlist.

Epix14251 about K-POP Music - KPOP Music Player for Youtube, v1.5.2