What were the kamikaze pilots singing in the file empire of the sun before Jim started his song?

In the film "Empire of the Sun," the kamikaze pilots are singing a traditional Japanese war song called "Kimi ga Yo." This song reflects themes of loyalty and patriotism, embodying the pilots' commitment to their country. Their singing serves as a poignant contrast to the innocence and vulnerability of the young protagonist, Jim, who later begins to sing "Suo Gan," a Welsh lullaby, highlighting the clash between war and childhood innocence.