I think statistically speaking. This is the most popular song ever recorded.
The Guinness Book of World Records 2009 Edition lists the song as a 100-million seller, encompassing all versions of the song, including albums. The original version, recorded in only 18 minutes was first released in 1949. It has never been out of print since.
It was listed as the world's best-selling single in the first-ever Guinness Book of Records (published in 1955) and - remarkably - still retains the title more than 50 years later."
http://www.youtube.com/watch?v=BKcdnGutxdI