Confira abaixo letras (lyrics) do Koutetsu Kyodai:

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ROBOMETAL Z-4 ~Robot Anime Hen~ (Robometal II ~Koutetsu no Chikai~)
ROBOMETAL Z-5 ~Tokusatsu Henshi Hero Hen~ (Robometal II ~Koutetsu no Chikai~)
ROBOMETAL Z-III ~Robot Anime Hen~ (Robometal ZZZ)
Brave Heart (Bakuso Kyoudai Let's & Go!! MAX)
Crush me Crush you (Bakuso Kyoudai Let's & Go!! MAX)
MUTEKI Fight it out (Bakuso Kyoudai Let's & Go!! MAX)
Kaze no Yell (Bakuso Kyoudai Let's & Go!! MAX)
RIDE on DREAM (Bakuso Kyoudai Let's & Go!! MAX)
Far Away (Bakuso Kyoudai Let's & Go!! MAX)
Eternal Fighter (Super Robot Spirits)
Gurungust ZAN! (Super Robot Taisen F)
BLACK HOLE (Super Robot Taisen Alfta 7)
Super Robot Eien nare (Super Robot Taisen F)
PLANET DANCE (Macross the Tribute)
METAL BROTHERS ~Koutetsu no Chikai~ (Single version)
One way (Single version)
Wonder Generation!! (Tetsuwan Tantei Robotack)
Get High! (Tetsuwan Tantei Robotack)
ROBOMETAL Z-1 ~Tokusatsu Hero Hen~ (Robometal ZZZ)
ROBOMETAL Z-II ~Metal Hero Hen~ (Robometal ZZZ)