Oh my goodness, Fred and Ginger. None better. I remember as a teen when everybody was going wild over Saturday Night Fever and John Travolta. Astaire was asked his opinion. If I remember correctly, his response was,that in essence all they were doing was a jitter bug.
But never forget that Fred and Ginger worked with Hermes Pan ( as others did, as well ), who was a GREAT choreographer.
The last truly great choreographer was Gower Champion. Fossey was marvelous,but all of his choreography was similar.