"Happy Birthday To You"
Yes, the song the entire Western world sings at birthday parties is actually owned by a large corporation, and every time someone sings it in public without permission, it is an infringement of copyright.
The song’s tune was published by schoolteachers Mildred and Patty Hill in 1893 as "Good Morning to All" in their book Song Stories for the Kindergarten. Children began singing it at birthday parties but with words they came up with themselves, which is how folk music typically develops.
Nevertheless, the song–lyrics and all–is now owned by Time Warner, the largest entertainment company on earth, and the corporation aggressively defends its property.