I couldn’t see this flagged anywhere so thought I’d post it to help others out, and possibly save them some time and frustration.
In the video tutorial for Piano Keys, the guy makes a mistake, doesn’t pick up on it, and it breaks the project. If your player breaks around halfway through the project, try searching ‘lastLyrics’ in your code and changing it to ‘lastLyric’.
I suspect CodeAcademy disabled the comments on this video because of people pointing out this error, which would be pretty unscrupulous. Rather than fix the issue, they’ve just hidden it, at the expense of their students… which is pretty ironic, considering how much the course talks about the importance of community.