Lots of good advice here -- especially Big Mick's well-thought-out response and Peter T's.

Something that crossed my mind is that kids nowadays do respond well to jump blues, especially if you talk to them about where it led in R&R and other forms they're familiar with. Which leads me to think they would also go for the precursors to rap (some of the talking blues, particularly the "Signifyin'" songs) and competitive dancing songs (Kill It Kid Rag) and things like that. Once you get their attention, I think you could lead them pretty well anywhere you wanted without resorting to some of the old preachy tunes that turned our cranks back in the '50s and '60s.

Good luck,

david