Most DJs pre-select the required amount of tracks in advance and arrange them in the order in which they plan to play. So that is complete predestination. Of course, such pre-planned sets can sound great at home, but they might be completely inappropriate on the dancefloor.

Pack twice as much music as you need You're a pop DJ, and you guess the average length of each song you want to play is three minutes. That means about twenty songs an hour. So you'll probably end up playing sixty songs in your set. Therefore, the crate you pack should contain 120 songs.