Exactly, make sure you have a vocalist who can bring it, especially during slow blues or ballads. Listen to Ray Charles' "Drown In My My Own Tears" or the original version of Buddy Guy's "Five Long Years"(although Buddy tends to get a bit histronic at times). Pick a variety of rhythms and grooves; there's nothing worse than song after song of straight Chicago shuffle. There's different types of shuffles as well, plus rhumba beats, eight-to-the-bar boogies, latin beats, double time, boogaloo, Chuck Berry style chunka-chunka, two-steps, and so on. Make sure you don't do too many, if any, songs in the same key in a row. Be entertaining in your presentation. Don't be afraid to work/jive the crowd. A few years ago, I saw Big Jay McNeely, one of the great 40's/50's sax honkers, in his mid-eighties, no less, actively sliding on up to and flirting with the sweet young things in the audience, on the dance floor itself.