What drives the song selection?

As we know that Chhote Ustaads has not been following any theme so far, and still we have seen the kids perform from the different genres quite brilliantly...

What do you think is currently driving the song selection for the kids?

What should they consider when they select songs in the future episodes?

What do the judges consider when they assign songs to the kids in the acid test round?

Are their some particular songs that you want to listen to from these kids?