this despite original  began life play central europe  weathered several incarnations followed mgms remake period songs good old summertime broadway show loves me even excellent theatre revival paris couple years ago remains definitive version one beat several previous commenters identified contributing factors make successful memorable least prevailing fashion s s hollywood lavishing attention detail ensemble playing rather two leads often happens today  try example removing ugarte ferrari renault etc casablanca yes still rick ilsa viktor lazslo theyd frosting without rich cake mixture below jimmy stewart maggie sullavan ideal irreplaceable leads much brighter shine performances reflected frank morgan felix bressart joseph schildkraut andy hardys sara haden factor lubitsch touch okay maybe tad naive innocent even jurassic age many genuine film lovers sated scatology screwing inyourface sex turn back days stories style slickness skill wallow great movies like one far best thing technological age csi dvd one time make classics available nostalgics show matrix freaks big boys used it