there is a scene in the movie empire of the sun where the kamikaze pilots sing a japanese song during their ceremony. it is also heard in the beginning of this video https://www.youtube.com/watch?v=r-THeBQyYZA
This is almost certainly Umi Yukaba (海行かば), a popular song among the Japanese military during WWII. The lyrics essentially are as follows:
"If (I) go away to the sea, my corpse will wash up... If (I) go away to the mountains, my corpse will lay in the grass... but (I) die for the emperor, (I) can do so without regret..."
The song was especially common among kamikaze pilots as well as other personnel. After the sinking of the Yamato, the surviving crew sung this song as they either waited to drown or were lucky enough to be picked up by the surviving destroyers.