The “Happy Birthday” song, the most frequently sung piece of music on Earth, was originally written in 1893 by two American sisters as a kindergarten classroom greeting called “Good Morning to All” — and the birthday lyrics now sung at every party on the planet were added almost twenty years later by an unknown author

If two women in 19th-century Louisville had written essentially anything else — a nursery rhyme, a folk hymn, a marching band number, a parlour song — their names would today be remembered, if at all, by approximately the same audience that remembers the names of other 19th-century educational songwriters. Instead, they wrote a four-line classroom [...] The post The “Happy Birthday” song, the most frequently sung piece of music on Earth, was originally written in 1893 by two American sisters as