Blue Hearts Theme was created on 1988-07-01.
The Blue Hearts was created in 1985.
The Blue Hearts Box was created on 1999-01-01.
From Broken Hearts to Blue Skies was created in 1999.
Meet the Blue Hearts was created on 1995-01-01.
Meet The Blue Hearts - video - was created in 1990.
The Blue Hearts no Dekoboko Chindōchū was created on 1995-07-10.
Blue Hearts ga Kikoenai was created on 1996-02-07.
Yume - The Blue Hearts song - was created on 1992-10-25.
'With Glowing Hearts' is the theme
The Blue Hearts ended in 1995.
Simple and Clean
The Kingdom Hearts 1 theme song is "Simple and Clean" and the Kingdom Hearts 2 theme song is "Sanctuary" (aka "Hikari" for Simple and Clean and "Passion" for Sanctuary). They keep those songs throughout the series.