<P> To understand the significance of this achievement , it is important to first define the `` break . '' Briefly , the `` break '' of a song is a musical fragment only seconds in length , which typically takes the form of an `` interlude '' in which all or most of the music stops except for the percussion . Kool Herc introduced the break - beat technique as a way of extending the break indefinitely . This is done by buying two of the same record , finding the break on each record , and switching from one to the other using the DJ mixer : e.g. , as record A plays , the DJ quickly backtracks to the same break on record B , which will again take the place of A at a specific moment where the audience will not notice that the DJ has switched records . Using that idea , Grandmaster Flash elaborated on Kool Herc 's invention of break - beat DJing and came up with the quick - mix theory , in which Flash sectioned off a part of the record like a clock . He described it as being `` ... like cutting , the backspin , and the double - back . '' </P>
who created the unique combination of cutting and double backing called the quick mix theory
Grandmaster Flash