I have found a compromise: seems like my wedding clients want something for everyone (who doesn't?) and are often teetering between hiring live music or a DJ. My solution has been to offer to play my regular instrumental stuff for the wedding party and their parents and older guests; and I carry an MP3 player with all the junky-dance stuff for the kids to enjoy during my breaks (from Pink's "Get This Party Started" and Emenem's "Without Me" to The Macarena, Disco Duck, YMCA, The Ketchup Song, etc.). Learned this from some band friends. Everybody's happy...