In Danjuro's katsurekimono (historical play), Danjuro and Sojuro always worked together, but they were not popular except amongst some of the intellectuals so, their play was called 'Son (damage) juro' using their names.
ちなみに、團十郎の活歴物は宗十郎と組ませるのが定石であったが、一部の識者以外には人気がなかったため二人の名をかけて「損十郎」と言われていた。