The term PARTS OF CHORUS LINES can be summarized as the different components that make up a CHORUS line. The crossword solution for this term is TRAS, which stands for the three main PARTS of a CHORUS line: the Tunes, Rhythms, and Steps. The tunes are the melodies and harmonies that make up the song, the rhythms are the beats and tempos that give the song its structure, and the steps are the choreography that the performers use to bring the song to life.