"Ka'rta Tor", which translates to "A Single Heart of Justice," was a traditional Mandalorian battle song from Mandalorian history, originally sung in the Mando'a language. Jango Fett, while instructing the clone troopers of the Republic, modified several battle songs like "Gra'tua Cuun," substituting conventional Mandalorian terms with Republic equivalents. It is believed that in this particular instance, he swapped "the Mandalorians'" with "The Jedi." The clone troopers would sing this chant while drums and horns played.
The Mando'a lexicon specifies that the correct spelling is kar'ta, which signifies "heart."