Don't forget the most famous whistling pop record of the 1960's. (It's a naff video, but the track is original.)
https://www.youtube.com/watch?v=hV6Un1PjciY
I believe that the record was rushed out to market in 1967 and was really made by the Mike Sammes Singers. I first heard it on Radio London, which went off air later that same year.