Daily UI Challenge #009 - Music Player

My "Music Player" design !
I think it's pretty easy to know WHAT to do for a music player, but it became difficult when you have to think on HOW to do it. And i guess that's why there's some LARGE EMPTY SPACES... So, maybe some details are missing but still, honestly i think it's correct and i hope you'll like it too !

Any recommendations or advices are truly welcome ! :)