Who wrote the birthday song?

In 1955, Igor Stravinsky arranged a variation of the song, called Greeting Prelude, to commemorate the 80th birthday of Pierre Monteux. The Russian-born composer wrote that he had been introduced to the tune only five years earlier, when members of an orchestra with whom he was rehearsing, to his bafflement at the time, played the tune in honor of a recent birth among the orchestra members.