Translation:It is the custom in New York to sing sweetly.
Just report them with "my solution should be accepted".
There are so many possible word orders that it is impossible to think of all of them. That's where we as the learners can help. :-)
Edit: This is how to deal with problems in the course: https://forum.duolingo.com/comment/33853120
BTW, in the meantime, I have had this "word order issue" myself with this very same sentence. You are not alone. ;-)