The best musical ever made besides the Wizard of Oz (well, I also like ~kitch Indian musicals such as Devdas and Dilwale Dulhania Le Jayenge [The Brave Heart Will Take the Bride] and "classic" by Jacques Demy - French ones such as Les demoiselles de Rochefort, Les parapluies de Cherbourg).

Pure joy and bliss. An autobiography of Hollywood itself at the dawn of its transition from silent pictures to sound ("talkie").

Singin' in the Rain IMDB page
Singin' in the Rain Wikipedia page

Debbie Reynolds (mother of princess Leia - Carrie Fisher!) did play Kathy Selden in Singin' in the Rain