The Piano Tuner's Dilemma

QUESTION: I am a piano-tuner by occupation. Should I as a Christian refuse to tune the pianos used in ball-rooms and theaters?

ANSWER: In this wicked world there is scarcely any business which does not bring the Christian into evil associations which can be avoided only by "going out of the world," as Paul says in I Cor. 5:10. A poor day-laborer must either go out of the world or do the work, the evil use of which he is not responsible for, asking no questions for conscience sake. Yet he is to listen to the voice of conscience and heroically starve, if he should be required to take a direct and active part, such as that of the bartender, or the brewer, or distiller, or dance fiddler. Tuning the piano is one thing, but playing it for the dance is another.

— Steele's Answers p. 237.