The melody of Happy Birthday to You dates back to 1893, when sisters Patty and Mildred Hill wrote the tune Good Morning to All. Birthday lyrics emerged in the early twentieth century and the song spread through parties, films and broadcasts until it became the world's most recognised celebration anthem. Short sung renditions like this one circulate widely online, where creators use them as quick, instantly recognisable musical punctuation for birthday content, reaction clips and festive compilations year after year.