I just got my chromecast in the mail today an everything is working great except for when I try to play music from the Google Play Music app. It keeps showing up an error message saying the device can not play side loaded music. I download all my music free from another app that I got in the Google play store and have never had a problem playing my music through the Google music app. It works fine excpet for when I try to play it through chromecast. I am unsure if you are only allowed to play music that is bought through play store or not. I really would like to play the songs I have on here now without having to go purchase them. Any help would be appreciated.