A bit off-topic, or maybe not (since turtablism/scratching is a major subset of all DJing), the documentary Scratch, by Doug Pray (2001) is now fully available on youtube.
So take a look.
Scratch is an incredible homage to the hip hop culture and the arise of turntablism as a language and the turntable as an instrument.
Only lacking the more experimental side of the art: Tetrault, Otomo, Marclay, etc… even so its greatly done.
2018 pedro lopes research All Rights Reserved, except when noted otherwise (see here).