"A Funky Break That Would Live Forever"

"A majority of the rap world was quick to follow in Marley's footsteps, as newly-affordable sampling equipment proliferated. While James Brown songs provided a rich source of tight, hard grooves to loop and rhyme over, the rapidly developing sound of hip-hop demanded innovation on an almost weekly basis, creating a huge demand for fresh breaks and catchy drums producers could manipulate.
"Enter Lenny Roberts, a Bronx-based music aficionado who had made some impact providing bootleg compilations of popular breakbeat tracks for DJs earlier in the decade."

Robbie Ettelson at Medium provides a history of the Ultimate Breaks & Beats series.