Well I had a lot and thanks to my old friend that shared this thing to me XD
I guess it sings very well on Eastern Asian languages (the best to Japanese, then Korean and Chinese... maybe others too)... Don't ever try on English... it's nightmarish... >.<
Well youtuber did used it for making national anthem... I don't know whether it's ok to be posted here...
For Japanese, this is the folk dance played during Bon Odori... This is hatsune miku + mikumikudance...
https://www.youtube.com/watch?v=nQ05FhY6OloFor Korean, it's hard for me to find... but this I find it'sssss soooo funny when comes to Korean Wonder Girls Gee XD
https://www.youtube.com/watch?v=nNypoTVUTJc&feature=relatedFor Chinese, only one song can be found... there are two... one being miku-ish and another one being is very clear and precisely pronounced... the former one used another variant of miku, which is Chinese-made
https://www.youtube.com/watch?v=eS7jrzilba8https://www.youtube.com/watch?v=uj_l1SWscdg