For you own personal use/enjoyment no there is no technical violation. However, assuming there is no "fair use", if you distribute the changed lyrics you are guilty of infringing the authors right to prepare derivatives and control distribution of his/her work.
Any Asian countries because it's illegal to put cuss words in a song
its called rewrite the song
Yes.
use your voicebox.
That would be copyright infringement if the original song was protected.
It Depends, your song HAS TO get checked by the owner of the original song if he/she says "no" its illegal if he/she says "yes" its ok.
No, it is not illegal to change a lightbulb in Australia.
Maybe
You Say Different Words/Lyrics.
No, but it is illegal to receive money for the files.
An illegal change of address is when a person gives a false address. There are fines and also a chance at a prison sentence for giving an illegal change of address.
No it is not illegal downloading a song which is not for sale.