If I had kids I think they would be better off not knowing about "the Blues." I would teach them things like intonation, sight reading and harmony. They can pick up the trashy aspects of life later, on their own terms. At 15 I thought BB King was corny, at 20 when I first heard Big Bill Broonzy...I was taken away with joy. Let the kids find their own way with the personalities, just expose them to good playing habits and a wide range of musical expressions.