Almost instant paywall. learning myself to play some score, my sight reading of the f staff definitely needs training, this app proved of absolutely NO USE, and I find the only available lesson "play cdefg" useless and lacking important notions. Not even was rhythm mentioned, playing out of the beat is still validated. Backing tracks are the cheesiest possible without musicality, synthetic. If you think guitar hero teaches to play the guitar, this app is for you. Waste of time.