The vocal characteristics of Japanese singers when they sing

Studied the Japanese language, know the 50 tone it, Japanese pronunciation, there is no rolled tongue, etc., and there is no 4 tone like ours, have you ever noticed that when they pronounce the words, the mouth shape is not too big to grow, if you have not learned the 50 tone words suggest that you go to learn the 50 tone first, so that you understand it, or else you can only rely on your super mimicry ability.