In my opinion, the mixture of music greatly depends on the age category of the dancers. An older crowd would favor more foxtrot, waltz, rumba, etc. A younger crowd would favor more swing (East Coast), cha cha, salsa, etc. Beyond this, my recommendation would be to have your base player and drummer emphasize the beat a little more than they are probably use to, don't drive it too hard, but provide emphasis. Dancers at all levels appreciate clearly hearing, or sensing, the "one" beat. There's nothing worse to me than trying to find the one beat in a song. Also, the bpm (beats per minute) is important. If you browse the "music store" section of this web site, you will find song titles listed by type of music plus the bmp for each song. This will give you an idea of the bpm for each dance. One final thought, I would suggest avoiding any music with changing tempo's or timing. Nothing worse for amateurs than trying to dance to music that starts slowly and then speeds up, or changes in the middle from 4/4 to 3/4 or 6/8.