These are sounds too specific to an individual performance to be pulled from a sound-effect library: footsteps, eating sounds, picking up props.

The prog-pop band 10cc employed a pretty interesting technique for that iconic vocal track in "I'm Not In Love".

Your Guide to the “Diddy Laugh,” a Sound Effect That’s Been Driving People Crazy for Decades It’s the Wilhelm Scream of cinematic laughter, and it has had a fascinating Hollywood journey.

Sound effects aren't preserved with the same care and consistency as images and voices, something the audio archiving community thinks should change.