Hello julianmustofa,
Thanks for using the Apple Support Communities! I understand you are unable to play a specific song in Apple Music. I'm happy to help you find some information.
"With Content & Privacy Restrictions in Screen Time, you can block or limit specific apps and features on your child's device. And restrict the settings on your iPhone, iPad, or iPod touch for explicit content, purchases and downloads, and privacy." Here is a link to help you check if explicit content is blocked:
Use parental controls on your child's iPhone, iPad, and iPod touch
I would also suggest trying the troubleshooting steps listed in the article below:
If an app unexpectedly quits, stops responding, or won’t open
If you have any issues after reviewing the links, please let me know. Also, can you tell me how long you have had this issue? Does the song play in iTunes? Was the song purchased from iTunes or downloaded from another source?
Have a good day!