The UI is terrible. Some songs you can like and they go to one playlist, and others you can't, but you can add them to your library and that's a different playlist. Your "songs" tab gives you two options: online and offline, but inexplicably there is no option to download the offline songs as a batch like you can for other apps. I genuinely have no clue how many songs I have liked/added or where they are located. I also seriously doubt at this price any songs are truly "HD."