"sakura sakura
yayoi no sora wa
mi-watasu kagiri
sakura sakura
yayoi no sora wa
mi-watasu kagiri"

"cherry blossoms cherry blossoms
across the spring sky
as far as you can see
cherry blossoms cherry blossoms
across the spring sky
as far as you can see"

It's an old Japanese folk song called "Sakura sakura". I remember reading from an interview back in the 80's that they put it there as a sign of thank you for their loyal Japanese fans who had sent them a small music box that played this song.