Hi Farhana, I agree about the word 'song'. 'Singing and dancing' is also acceptable, but 'song and dance' is more appropriate because it is a common category for performances. I will add one thing: If the reader/listener is familiar with India, the sentence will be fine. If the reader/listener is not familiar with India, it may not be clear what is ''known more formally as Rajaji Nagar in Thiruvananthapuram''. Are the kids known as Rajaji Nagar? Or is Chenkalchoola known as Rajaji Nagar? You could make this perfectly clear by saying "who are known more formally", or, "which is known more formally". You may not need it. It just depends who the intended audience of your writing is.

I would say ‘song’ instead of ‘sing’. (‘Song’ is the noun form; ‘sing’ is the verb.) Otherwise, it’s excellent.