It looks like you changed the playSong variable from an arrow function to a regular function.
Try resetting the step and only adding the code you are asked, without modify the other parts of the code.
If you are still having problems, please post your full code.
Here are some instructions:
When you enter a code, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.
You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.
See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').
Happy coding