You can get the lyrics and ask them, or you can look them up if you know the title of the song. Many online lyrics have Chinese and Japanese meanings.
Japanese translation websites, the better ones are
Yahoo: http://honyaku.yahoo.co.jp/transgext (you can compare word for word, and you can probably understand it if you have a Japanese foundation).
It seems to be from three provinces: http://www.excite.co.jp/world/chinese/.
Personally feel better than Yahoo. If you are more imaginative ...)