Choosing source material is half the creative work of sample-based production
Half the skill and creativity of sample-based music is in finding and choosing the samples to start with. Crate digging — hunting through old records, or grabbing material from sources like YouTube while staying mindful of usage rights — is as much a creative act as the chopping itself, and a producer’s taste in samples can become part of their sonic signature or a nod to influences. Source material need not be found: bouncing and chopping your own studio loops builds a personal crate, and library/expansion samples are fair game too, because chopping a loop rather than using it straight puts your own twist on it.
Examples
DJ Shadow digging in a Sacramento record-shop basement; bouncing your own drum-machine sketches to WAV to chop later; chopping a factory loop for a unique variation.
Assessment
Explain the creative role of source-material selection, and give at least two strategies for sourcing samples (digging, self-bounced loops, library packs).