I can still see Judy Garland and Fred Astaire singing this song.

I'm not home right now, but it might be in one of the Readers Digest Songbooks I have at home.

Irving Berlin wrote it, and it was featured in Easter Parade, and probably other musicals. I've looked quickly on the 'net and don't see any of the Irving Berlin or Musicals web-sites which have this song. IF someone doesn't get back sooner, I'll look when I get home late tonight.