Why DJ reading the crowd is really important for the dancefloor !! It's not way they dress or look of appealing but the main important of reacting of dancing from the body movement or singing along the main chorus of the song. From my personal experience, I have always listen if the crowd in the bar or nightclub event that sing more vividly over the songs but using genre of music or yearly of their childhood music they know. If I was to DJ in a nightclub, I would encourage