If you pay for the premium service, this also allows you to bump up the quality of audio that plays - which is set at 160kbs on the standard player but can be increased to 320kbs when the premium is paid for. The player also includes a lot of non-music extras, per se, such as podcasts, speeches, and lectures.
It plays a variety of artists and musicians and you have the ability to pay for the service, which will remove the ads that are embedded. The software is like all other music-playing apps that are online right now.