Oh, I haven't gone anywhere! Still here, following along - and thanks for all the contributions so far. The result to now is that I've been reminded of a number of melodies that I'd forgotten about, but that I already 'know' either in the sense of having deliberately learned to play them at some point in the distant past or having the sound of them back in the hidden recesses of my head. And, judging by this thread, there may be some newer stuff that would be suitable, but not imperative - so I think I can ignore a couple of tunes that don't appeal to me enough for the effort it would take me to learn them well enough to perform.

Now, the other part of the story is that I'm starting to think that this gig has fallen through - it needed to be confirmed by 'the club', and I haven't heard anything but crickets lately. So I'm trying to keep up some enthusiasm for getting the tunes up to speed, but .....