I seldom, if EVER, have a problem on gigs from this agent BUT I learned a loooooooooong time ago to ALWAYS make personal contact with the client so that there is no misunderstanding about what is expected ...
As for "DJ"ing tunes I don't play, well I usually ONLY do that when working a party that wants certain 'line dances' i.e. the Cha Cha Slide, and I tell them in advance that's what I will be doing ... and I don't think the client in this situation would have been happy with a "DJ" performance when they were looking for LIVE music ...
It's tough enough for musicians nowadays ... I'm not going to 'promote' "DJ"ing if I can help it ...
t.