Press/click the flag to start. You just need to click on the button and the song will start. To go to the next backdrop, click the arrow pointing towards the right. To go back, click the arrow pointing towards the left. Click the star that says 'Stop' to stop all sounds. Hit dat LIKE button(s)! :P
Thanks to TreyBurke3 for making something like this and inspiring me. All the songs are by Imagine Dragons.