Dear Naohiro19,
Reverting a correction to such an obvious spelling mistake as "Dicography" (which I changed to "Discography") back to "Dicography" and calling this some type of vandalism is not exactly what I had in mind when thinking of co-operating on and for Wikipedia. Perhaps other people can persuade you to admit that making a mistake such as a spelling error is not the end of the world, not is any correction of such a mishap. With best regards, Nicovdwater.