Whatever you are told, the most important thing in the set from any DJ is music. This seems obvious, but many teachers and course leaders often forget the important thing: you need to listen to a lot of music! To do this, it is desirable to constantly look for something new, thus forming a large library.
And if before such a music library consisted of boxes with vinyl records, now all the musical variety can be stored in digital format. It is convenient, mobile and cheap. In fact, it is the search for music and the preparation of the set that takes the most time, because the music must be relevant and / or popular, and its fragments must be harmoniously combined with each other.