Songs are fun, but the lag is ridiculous. On nearly every song I've played lately, it doesn't register I hit the note, especially if I'm doing well, and especially if it's a double hit. It's like someone intentionally made it so you would mess up, just to incentivize you to purchase gems to keep going to maintain your streak/high score. If that could be fixed, this game would absolutely be 5 stars. However, since I can't even play through a single song without it glitching, I can't give it that.