how did rudolph the red-nosed reindeer originated

Rudolph the Red-Nosed Reindeer is a classic Christmas song written by Robert May in 1939. The song was originally called "Rudolph the Red-Nosed Raindeer," but the name was changed to "Rudolph the Red-Nosed Reindeer" to avoid confusion with the popular song "Rain, Rain, Go Away." The song tells the story of a reindeer with a bright red nose who is teased by the other reindeer but ultimately saves Christmas by guiding Santa's sleigh.