We backed him up the night before in Bozeman. Cash for Chuck up front. I blew blues harp with him on a number (not one of his songs) and once he discerned I had the feeling, he pushed me up front to his Mic for a solo! When the number ended, he held my arm aloft like a winning prizefighter, and egged 'm on. What a thrill and an honor! Our sidemen had no problems with Chuck, once they knew there was no set list or advisory of song  keys. Wing it, be a pro. Crowd of 10,000, since it was part of a two-night Homecoming festival. Of course My Ding-a-Ling got the biggest response. May Mr. Whitekeys live long and rock on!