Short phrases with energy
Shouts and ad-libs are the vocal equivalent of a crash cymbal: a “hey!”, “let’s go”, a crowd chant or a laugh that punctuates a section. In hip hop they fill gaps between lines; in EDM, house and jersey club they announce the drop. Because they are short and dry, they are easy to pitch, chop and throw into effects.
Finding clean ones
Look for dry, close-miked recordings without music behind them. A shout with reverb baked in is harder to fit to your space. Stack a few takes, or the same take pitched slightly, for a gang-vocal effect.
Vocals carry more rights than other samples: there is the recording, and there is the person’s voice. Free libraries where performers record lines for others to use are the safest source. Every card shows the licence verdict, and the credit line when one is required.