Aria De Mezzo Carattere is my favourite though not technically vocal.

I didnt like the sudeki da ne at the spring scene but I liked it during the credits, similarly with 1000 words, I really hated the Jpop version but adored it at the credits.

Melodies of Life was very well integrated in the game but though it isnt sung with engrish atleast, there are still some pronunciations that stop it being perfect.