Some songs? Fantastic, you start playing and the taps just vibe perfectly, feels awesome. Most songs? There are just random taps that just don't sync up to the pattern you should be vibing with, like switching to background instruments for two beats when you should be on vocals. And then some songs just throw taps that aren't even to a beat! And worst of all; if your gonna take out a swear word that hits on an integral beat of the song and replace it with dead space, DONT PUT THE SONG ON THE APP