I laid out the first structure for the actual iOS app. It is based on a singular view, that switches between 3 states: .waiting, .scanning and .playing. In .waiting state, it just shows a big, colored button. If that button is clicked, it switches to the second state, where a QR code viewfinder appears. If a QR code is detected and correctly parsed, it switches to the third state, where I will later add the functionality to look up and play the songs.