If you have Spotify (premium at that), this new feature they have introduced called Connect might be of interest to you. Basically, what they have done is found a way to seamlessly switch your listening experience from different devices to play in different rooms and/or speakers at your preference. So if you come home and you’re listening to music through your phone, you can switch to your living room speakers and Spotify on your iPad. Or from your Kitchen dock, to your bedroom speakers and vice versa.
The new update will be available to Spotify Premium subscribers on iPhone, iPad and home audio systems in the near future, and Android and desktop users soon after.