What is the origin of song Sing if your Way Home?

"Singin' in the Rain" is a 1952 American musical romantic comedy film directed and choreographed by Gene Kelly and Stanley Donen, with musical numbers staged by Kelly and Donen. It stars Gene Kelly, Donald O'Connor, and Debbie Reynolds. The film is set in Hollywood during the late 1920s, and tells the story of a silent film star (Kelly) who falls in love with a chorus girl (Reynolds) during the transition to talking pictures. The film is best known for its iconic title song, which was written by Arthur Freed and Nacio Herb Brown.

According to Donald O'Connor, he came up with the idea for the title song while he was taking a shower. He said, "I started to sing, 'I'm singin' in the rain, just singin' in the rain, what a glorious feeling', and I thought, 'That's it! That's the title of the movie!'" The song was originally written in a slower tempo, but Kelly sped it up so that he could do more dance moves in the rain. The scene where Kelly sings and dances in the rain is considered one of the most iconic scenes in film history.