If the business scope is wide, there will be dance training, so if you want to find singing training, you can go to the art training center in the old city and ask if there is any training related to singing.
Because singing, dancing and playing musical instruments are the three key projects of the art training center. So, singing will definitely happen. As long as there is an art training center, there will be a place to learn to sing.
If you want to see other places where you learn to sing, you can go to the Children's Palace and ask. Children's Palace generally has singing lessons, and the fees there are generally much cheaper than those in art training centers.