“the two pianist had a good marriage. They always were in a cord” in two sentences, interpret the figure of speech in the statement, make sure to include the word or language, being used in the figure of speech, and explain the deeper meaning

The figure of speech being used in this statement is a pun, specifically on the word "chord." In music, a chord is a group of notes played together to create harmony. The deeper meaning of this pun is that the two pianists had a harmonious and successful marriage, always in sync with each other and working together seamlessly.