Missed the Spotify or iTunes window again? Install Simplify to always know what's playing right now, seamlessly control playback and volume without switching to the application itself.
Simplify displays the currently playing track on your desktop with album artwork, however you want it!
If you prefer to use shortcuts instead of mouse or trackpad, you can use the fully customizable keyboard shortcuts. Control play, pause, skip, rewind, fast forward, and set volume up/down. You can also toggle the floating mini-controller, allowing another way to control Spotify and iTunes.