Koda Kumi & Namie Amuro - butterfly

I also noticed this similaries-but I don't think a lot about it.
I think there are a few Titles japanese Artists really love to use (like Honey)

As far they don't use other Artist's Lyrics everything is Ok^^

I noticed the Namie and hitomi ones a while back. Now that I look at it they share so many titles.

wowie..and umm

Rei Tanaka has a song called Ningyo Hime..so does Kumi ^^

Some covered songs used the same lyrics. :innocent