The song "Singin' In the Rain" is a centerpiece of the musical film of the same name, Singin' in the Rain (1952).
AFI lists the 1952 movie as #10 on their all time movie list, and the song from the 1952 movie as sung by Gene Kelly #3 on their all time song from a movie list.
"Singin' in the Rain" was first performed by Doris Eaton Travis in the 1929 revue The Hollywood Music Box Revue. The song became a hit and was recorded by a number of artists.
By far, this version sung by Gene Kelly in the 1952 movie is the most popular version of the song. It's no wonder this is so popular given Kelly's dance routine and vocals.
In the famous dance sequence in which Gene Kelly sings the title song while spinning an umbrella, splashing through puddles and getting soaked to the skin, Kelly was sick with a 103 °F (39 °C) fever. A common myth is that Kelly managed to perform the entire song in one take, thanks to cameras placed at predetermined locations. However, this was not the case, as the filming of the sequence took place over 2–3 days.