Normally record artists and producers hold the rights to famous music and want to see money when you play or cover it anywhere public. But public domain songs let your more or less do what you want with it. Even sing them with Jamie Foxx on your late night show. Funky!
“Lacking a budget for licensed music, James and Jamie Foxx sing well-known tunes that don’t carry a price tag, like ‘Twinkle Twinkle Little Star.'”