I've been trying to answer this with internet searching but can't find a definitive answer. Is a nursery ryhme fair use? I've looked it up and there are about 200 copyrighted versions of Twinkle Twinkle Little Star, but I'm pretty sure they're all special arrangments or performances. In my documentary there is a clip of a girl singing this song in Spanish. It's no special arrangement or anything, and as it's in a foreign language I think it's fair use. Can anyone confirm that?