This is part of what prompted the original post. Although we enjoy dancing to golden age tangos, we almost prefer live (non-tango) because of the uncertainty. Blues, jazz, reggae, etc. all have well defined structures, or perhaps I know a version of the song. But, and especially with jazz, the details when played live can be quite surprising and can create a dynamic tension between myself and my partner, which I find lacking when we dance to one of the handful of GA tangos which are played repeatedly. And this is why I do NOT enjoy DJed "alternative" events. They have the downside of not being tango and the downside of being overly predictable. One or the other, ok. But I can only dance to "Over the Rainbow", or "Red Right Hand", or whatever else is currently popular in the alt scene, so many times before I just want to scream.