I remember DDS1's vocal track being pretty cool although that was written by Americans. In America.
Japanese DDS1 didn't use the same vocal track if I recall. Still I preferred that style over DDS2's.
DDS1 J used Sera's theme, with vocals. It's a lot slower and darker.
I preferred Danger(the US opening).
What WAS written by Atlus USA for the Japanese version was Persona 4's opening, and it was all the better for it.