Also wondering if any one knows when music was added and by whom? My wife vaguely recalls that the version converted to Christmas was sung in an early movie (doesn't think it was Bing Crosby). She doesn't remember the Thanksgiving original ever being sung. Harao mentioned 1938, he thinks from Dick Greenhaus (in the other thread). If the tune (or tunes) are 20th century, we should be able to find the source.