While many people (me included) attend both sorts of events, it is rather patently obvious that techno contras and traditional contras are somewhat different beasts. While there are general differences in ambiance and potentially in audience, the biggest and most obvious difference is the music: traditional contras generally have live bands playing music that either they composed/arranged themselves, or that has been passed down for generations through the folk process. Crossover contras frequently experiment with contra dancing to music that has been both recorded and possibly remixed. While some DJs work completely with their own material, frequently this involves using others’ intellectual property which, if created after 1923, probably has an interested copyright holder behind it.