How to set a turntable?

However it was Grand Wizard Theodore, an apprentice of Flash, who accidentally isolated the single most important technique in turntablism: scratching. He put his hand on a record one day, to silence the music on the turntable while his mother was calling out to him and thus accidentally discovered the sound of scratching by moving the record back and forth under the stylus. Though Theodore discovered scratching, it was Flash who helped push the early concept and showcase it to the public, in his live shows and on recordings.