Moral boundaries for a Christian DJ and other work

A host describes sticky situations in his DJ business when the job he is hired to do conflicts with his convictions - what music he will play, what gigs he will take. The hosts generalize to other work: whether to take jobs from companies whose business you do not condone, and how explicit to be about faith, with one host noting he does not promote himself as a 'Christian DJ' who plays only Christian music.