"Undefeated" was a favorite song of House Gensa. (TOS novel: The Final Reflection)
" [Zharn] was humming "Undefeated". Segon, a lightly armoured Vanguard, was keeping time with his bootheel. A little farther away, Graade and Voloh, the other Vanguards, held hands and kept harmony.
Zharn began to sing aloud, and in a moment, they were all singing.
And though the cold brittles the flesh, the chain of duty can not be broken
For the chain is forged in the heart's own fire, which cold can not extinguish "
....
" The klin zha players filed out of the room, marching in step down the green corridor, singing
Yet if my line should die, it dies with its teeth in the enemy's throat
It dies with it's name on the enemy's tounge.
For just as mere life is not Victory
Mere death is not Defeat;
And in the next world, I shall kill the foe a thousand times,
Laughing,
Undefeated ! "