I don’t have a real system for selecting the music I dance to. Most of the time, I just go into one of my playlists and select a random song until I like one. I used to care that I don’t dance to the same song twice but I don’t care that much anymore.
Lately, I try to find new music that I don’t already have. It is fun to search for something new and it is a good chance for me to get some new music at the same time.