How can I delete a song that states unable to delete, it may be used by another application. I've searched but can't delete it anywhere. What apllication might be using it???????

Somebody might be uploading it (check your monitor window.) Wait for them to finish or quit.

You might have an audio player open. Close down all apps that might have used it & then try deleting it.

Hey! This is Bear land! How did I get here!