DJ Shadow, 1996. First album made entirely from samples. Building Steam with a Grain of Salt, Stem/Long Stem.
From Wikipedia
Endtroducing..... is the debut studio album by American music producer DJ Shadow, released on September 16, 1996, by Mo' Wax. It is an instrumental hip hop work composed almost entirely of samples from vinyl records. DJ Shadow produced Endtroducing over two years, using an Akai MPC60 MKII sampler and little other equipment. He edited and layered samples to create new tracks of varying moods and tempos.