I love this song too. It's a funny thing - just yesterday I was playing YET ANOTHER version of this song: by Peter Van Steeden's Orchestra, on Supertone (off Gennett). I can't give you a link to it (my computer's down at home! )
- but it's a really nice side. Very mellow arrangement with creative scoring for saxophones. Recorded much later than the song's initial 1927 popularity (this one's from early-mid 1928); I think when Sears' Silvertone ceased as a label and Sears Roebuck started up with Supertone, they re-recorded several slightly earlier hits (such as "Let a Smile Be Your Umbrella" and "I'm Looking Over a Four Leaf Clover") for the first few issues on the new (Gennett) Supertone label. (At least that's what I think happened; I wasn't there...)
Anyway, I love the Van Steeden band from that period. Great arrangements, especially "Louisiana", "If You Want the Rainbow (You Must Have the Rain)" and "My Blue Ridge Mountain Home". Too bad the records are so scarce!