Who wrote "Happy Birthday to You"?

Finally I know something about a melody I hear since I was 5. In Portuguese we sing: Parabens a Você Nesta data querida Muitas Felicidades Muitos Anos de Vida Hoje é Dia de Festa Cantam as Nossas Almas Para o (a) menino(a) ___(nome do aniversariante) Uma salva de palmas Congrats you In this dear date Lot’s of Happiness Lot’s of Years’ Life Today is a Party Day Our Souls Sings

For (person nickname having birthday) With a loud applause

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