Musical Monday #176

So this is the finale of South Pacific and therefore a total spoiler if you haven't seen it.

Some context so you can enjoy the scene better: she's happy because he isn't dead and he's happy because she isn't a racist any more.

Dites-moi (finale) from South Pacific
Performed by Mitzi Gaynor, Candace Lee, Warren Hsieh and Rossano Brazzi (acting) and Giorgio Tozzi (singing)
Written by Richard Rodgers and Oscar Hammerstein II

Now is it just me, or is it painfully and detrimentally obvious that the guy's singing voice is dubbed?  I don't get why they did that so much in old movies.  Either hire an actor who can sing in the first place or if they can sing, obviously let them sing for themselves, and if for some reason you still have to dub them at least try to match the voice with the actor.