Just got my Chromecast and love it, especially the Backdrop feature. Is there a way to play music from a source like Spotify while having Backdrop active? Having a big album artwork on the screen isn't as appealing as the photos Backdrop displays.
EDIT: Right now I have a PS4, Mac Mini and Chromecast all attached to my Panasonic Viera HDTV. Though I'd like to both play music and watch Backdrop on the Chromecast, for now I play music on the Mac Mini (Spotify Mac app) and leave the Backdrop going. I'm really blown away by the device. It out-Apples Apple in such colossal ways. Well done, Google.