Singin’ in the Rain can be described as many things and in a variety of ways, and I’m gonna do my best here:
Quite possibly nobody has ever had as much fun on screen as the leading trio of Kelly, O’Connor and Reynolds 
I miss when movie stars in musicals ACTUALLY sung and danced like their lives depended on it, and I miss just as much that the camera allows them to show off the choreography properly
This is a film about love, and about coming to terms with time. It’s a film about filmmaking and the art and passion and talent that comes together for it. It’s a film about being true to oneself, and about the importance of living a happy life. It’s a jaw dropping musical, with such fun and charming numbers. It’s an astonishingly produced film, taking place on city blocks from LA to Broadway, on sound stages that look like an endless void of beauty. The camera operates on levels both literally and metaphysically. It flows around like a behind the scenes documentary and a flat out film on the set within. It’s a literal laugh out loud comedy with a witty script and even better slapstick comedy out of Donald O’Connor. It even takes a dark turn in the finale as Lina turns full heel and tries to ruin careers
Passion exudes through every pore of this film even 70 years later, and it’s part of the reason why it has gloriously stood the test of time
Crazy to think that maybe 3% of movie musicals since this have barely managed to even come close to a trailblazer like this. Do better Hollywood!!!