Yes, you did the right thing, which is to state your needs, and always be nice about it.
Of course I was not meaning to disparage "Summer Wages", one of my favourite songs. Its a no-brainer in the sense that if I can't think of what to play, and there I am on a stage, that's the one I'll do, and _hope_ the band can handle it cause I can't think of anything they'll be much more comfortable with...
I don't think I'll ever use that stupid expression "no-brainer" again though. I've seen it used too many times in such a way that only the writer knows what the hell he is talking about.